The sum of all the edges of a figure is the perimeter of the figure.

2. What is the area?

The size of the surface of an object or the plane figure surrounded by it is called their area.

3, the relationship between the parts of addition:

One addend = and-the other addend.

4, the relationship between the parts of subtraction:

Minus = Minus-Difference Minus = Minus+Difference

5, the relationship between the parts of multiplication:

One factor = product ÷ another factor

6, the relationship between the parts:

Divider = divider, quotient dividend = quotient × divisor

7. Angle

(1) What is an angle?

A figure composed of two rays drawn from a point is called an angle.

(2) What is the vertex of an angle?

The endpoint of an angle is called a vertex.

(3) What is the edge of a corner?

The rays that form an angle are called the edges of the angle.

(4) What is a right angle?

An angle of 90 degrees is a right angle.

(5) What is a right angle?

The two sides of an angle are on a straight line, and such an angle is called a right angle.

(6) What is an acute angle?

An angle less than 90 is an acute angle.

(7) What is an obtuse angle?

An angle greater than 90 and less than180 is an obtuse angle.

(8) What is a fillet?

The angle formed by a ray rotating around its endpoint is called a fillet, and the fillet is equal to 360.

8.( 1) What is vertical? What is a vertical line? What is a drooping foot?

When two lines intersect at right angles, they are perpendicular to each other, one of which is called the perpendicular of the other, and the intersection of these two lines is called the vertical foot.

(2) What is the distance from a point to a straight line?

Draw a vertical line from a point outside the line, and the distance between the point and the vertical foot is called the distance from the point to the line.

9. Triangle

(1) What is a triangle?

A figure surrounded by three line segments is called a triangle.

(2) What sides does a triangle have?

Each line segment forming a triangle is called an edge of the triangle.

(3) What is the vertex of a triangle?

The intersection of every two line segments is called the vertex of a triangle.

(4) What is an acute triangle?

A triangle with three acute angles is called an acute triangle.

(5) What is a right triangle?

A triangle with a right angle is called a right triangle.

(6) What is an obtuse triangle?

A triangle with an obtuse angle is called an obtuse triangle.

(7) What is an isosceles triangle?

A triangle with two equal sides is called an isosceles triangle.

(8) What is the waist of an isosceles triangle?

In an isosceles triangle, two equal sides are called the waist of the isosceles triangle.

(9) What is the vertex of an isosceles triangle?

The intersection of two waists is called the vertex of an isosceles triangle.

(10) What is the base of an isosceles triangle?

In an isosceles triangle, the side that is not equal to the other two sides is called the base of the isosceles triangle.

(1 1) What is the base angle of an isosceles triangle?

The two equal angles on the base are called the base angles of an isosceles triangle.

(12) What is an equilateral triangle?

A triangle with three equilateral sides is called an equilateral triangle, also called a regular triangle.

(13) What is the height of the triangle? What is the base of a triangle?

Draw a vertical line from the vertex of a triangle to its opposite side. The line segment between the vertex and the vertical foot is called the height of the triangle, and the opposite side of the vertex is called the bottom of the triangle.

What is the sum of the internal angles of a triangle (14)?

The sum of the internal angles of a triangle is 180.

10, quadrilateral

(1) What is a quadrilateral?

A figure surrounded by four line segments is called a quadrilateral.

(2) What is equilateral?

Two groups of parallelograms with parallel opposite sides are called parallelograms.

(3) What is the height of the parallelogram?

Draw a vertical line from one point on one side of the parallelogram to the other. The line segment between this point and the vertical foot is called the height of the quadrilateral.

(4) What is a trapezoid?

A quadrilateral with only one set of parallel sides is called a trapezoid.

(5) What is the bottom of the trapezoid?

A set of mutually equal sides in a trapezoid is called the bottom of the trapezoid (usually the shorter bottom is called the upper bottom and the longer bottom is called the lower bottom).

(6) What is a trapezoidal waist?

In a trapezoid, an unequal set of opposite sides is called the waist of the trapezoid.

(7) What is the height of the trapezoid?

Draw a vertical line from a point on the upper bottom to the lower bottom. The line segment between this point and the vertical foot is called the height of the trapezoid.

(8) What is an isosceles trapezoid?

An isosceles trapezoid is called an isosceles trapezoid.

1 1. What is a natural number?

0,1,2, 3, 4, 5, 6, 7, 8, 9,10 ... are all natural numbers (natural numbers are all integers).

12, what is rounding?

When finding the divisor of a number, look at the number on the mantissa. If it is 4 or less, the mantissa is discarded. If it is 5 or more, after removing the mantissa, add 1 to the previous number. This method of finding approximate value is called rounding.

13, meaning of addition and arithmetic.

(1) What is addition?

The operation of combining two numbers into one number is called addition.

(2) What is addend?

The addition of two numbers is called addend.

(3) What is harmony?

The result of adding addends is called sum.

(4) What is additive commutative law?

When two numbers are added and the positions of addends are exchanged, their sum remains the same. This is called additive commutative law.

What is subtraction?

Given two numbers and one addend, the operation of finding the other addend is called subtraction.

15, what is the minuend? What is subtraction? What is the difference?

In subtraction, the known sum is called the minuend, the subtracted known number is called subtraction, and the obtained unknown number is called the difference.

16, the relationship between the addition parts:

Sum = addend+addend = and-another addend

17, subtract the relationship between the parts:

Difference = minuend-minuend = minuend-difference = minuend+difference

18, multiplication

(1) What is multiplication?

The simple operation of finding the sum of several identical addends is called multiplication.

(2) What is a factor?

Multiplying two numbers is called a factor.

(3) What is a product?

The number obtained by multiplying the factor is called the product.

(4) What is the multiplicative commutative law?

When two factors are multiplied, the positions of the factors are reversed and their products remain unchanged. This is called multiplicative commutative law.

(5) What is the law of multiplicative association?

When multiplying three numbers, multiply the first two numbers and then the third number, or multiply the last two numbers and then the first number, and the product remains unchanged. This is the so-called law of multiplication and association.

19 branch

(1) What is division?

Given the product of two factors and one of them, the operation of finding the other factor is called division.

(2) What is dividend?

In division, the known product is called dividend.

(3) What is a divisor?

In division, a known factor is called divisor.

(4) What is business?

In division, the unknown factor is called quotient.

20, the relationship between the parts of multiplication:

Product = factor × factor One factor = product ÷ another factor

2 1 and (1);

Quotient = dividend/divisor = dividend/quotient

(2) the relationship between each part of division and the remainder:

Dividend = quotient × divisor+remainder

22. What is a name number?

Usually, the sum of the measured number and the unit name is called the nominal number.

23. What is a single number?

A number with only one company name is called a single number.

24. What is a composite number?

Numbers with two or more unit names are called composite numbers.

25. What is a decimal?

Imitate the writing method of integers, write them on the right side of integer digits, separated by dots, and the numbers used to represent one tenth, one hundredth and one thousandth are called decimals.

26. What are the basic properties of decimals?

Adding zero or removing zero at the end of the decimal makes the size of the decimal unchanged, which is called the basic property of the decimal.

27. What is a finite decimal?

The number of decimal places is limited. A decimal is called a finite decimal.

28. What is an infinite decimal?

Decimals with infinite digits are called infinite decimals.

29. What is a round festival?

A number in which each part of the cyclic decimal system repeats in turn is called the cyclic part of this number.

30. What is a pure cyclic decimal?

The cyclic segment starting from the first decimal place is called pure cyclic decimal.

3 1, what is a mixed cyclic decimal?

Loop segments that do not start with the first decimal part are called mixed loop decimals.

32. What are the four operations?

We call the four operations of addition, subtraction, multiplication and division four operations.

33. What is an equation?

Equations with unknowns are called equations.

34. What is solving an equation?

The process of solving equations is called solving equations.

35. What is a multiple? What is a divisor?

If A is divisible by B, A is a multiple of B, and B is called a divisor of A (or a factor of A).

36. What kind of number is divisible by 2?

Numbers with 0, 2, 4, 6 and 8 in a unit can be divisible by 2.

37. What is an even number?

A number divisible by 2 is called an even number.

38. What is an odd number?

Numbers that are not divisible by 2 are called odd numbers.

39. What kind of number is divisible by 5?

A number with a unit of 0 or 5 can be divisible by 5.

40. What number is divisible by 3?

The sum of digits of a number can be divisible by 3, and so can this number.

4 1, what is a prime number (or prime number)?

If a number has only 1 and its two divisors, such a number is called a prime number.

42. What is a composite number?

A number has other divisors besides 1 and itself. Such numbers are called composite numbers.

43. What is a prime factor?

Every composite number can be written as the product of several prime numbers. Every prime number is a factor of this composite number, which is called the prime factor of this composite number.

44. What is a factorization prime factor?

Multiplying a prime factor by a composite number to represent it is called prime factor decomposition.

45. What is a common divisor? What is a common divisor?

The common divisor of several numbers is called the common divisor. One of them is called common divisor.

46. What is a prime number?

Two numbers whose common divisor is only 1 are called prime numbers.

47. What is a common multiple? What is the least common multiple?

The common multiple of several numbers is called the common multiple of these numbers. The smallest one is called the least common multiple of these numbers.

48. Score

(1) What is a score?

Divide the unit 1 into several parts on average, and the number representing such a part or parts is called a fraction.

(2) What is a fractional line?

The horizontal line in the middle of the score is called the fractional line.

(3) What is the denominator?

The part below the fractional line is called the denominator.

(4) What is a molecule?

The part above the fractional line is called the numerator.

(5) What is a decimal unit?

Divide the unit "1" into several parts, indicating that some of them are called decimal units.

49. What's the score?

(1) For two fractions with the same denominator, the fraction with larger numerator is larger.

(2) For two fractions with the same numerator, the numerator with smaller denominator is larger.

(3) What is a true score?

Fractions with numerator less than denominator are called true fractions.

(4) What is a false score?

Fractions with numerator greater than denominator or numerator equal to denominator are called false fractions.

(5) What is a score?

A number consisting of an integral fraction and a true fraction is usually called a fraction.

(6) What is the basic nature of the score?

The numerator and denominator of a fraction are multiplied or divided by the same number (except 0) at the same time, and the size of the fraction remains the same, which is the basic property of the fraction.

(7) What is approximate score?

Turning a fraction into a number equal to it, but with smaller numerator and denominator, is called divisor.

(8) What is the simplest score?

A fraction whose numerator and denominator are prime numbers is called simplest fraction.

50, than

(1) What is comparison?

Division of two numbers is also called the ratio of two numbers.

(2) What is the preceding paragraph?

The number before the comparison symbol is called the previous item of the comparison.

(3) What is the last item of comparison?

The number after the comparison symbol is called the last item of comparison.

(4) What is the ratio?

The quotient ratio obtained by dividing the former term by the latter term.

(5) What is the basic nature of the ratio?

The first term and the second term of a ratio are multiplied or divided by the same number at the same time (except 0), and the ratio remains unchanged, which is called the basic property of the ratio.

5 1, cuboids and cubes

(1) What is an edge?

An edge where two faces intersect is called an edge.

(2) What is a vertex?

The point where three sides intersect is called a vertex.

(3) What are the length, width and height of a cuboid?

The length of three sides intersecting at a vertex is called the length, width and height of a cuboid.

(4) What is a cube?

A cuboid with equal length, width and height is called a cube.

(5) What is the surface area of a cuboid?

The total area of six faces of a cuboid is called the surface area of a cuboid.

(6) What is the volume of the object?

The space occupied by an object is called its volume.

52. Circle

(1) What is the center of a circle?

The point of the center of the circle is called the center of the circle.

(2) What is the radius?

The line segment connecting the center of the circle and any point on the circle is called radius.

(3) What is the diameter?

The line segment whose two ends pass through the center of the circle is called the diameter.

(4) What is a circumference?

A curve around a circle is called a circle.

(5) What is pi?

We call the ratio of the circumference to the diameter of a circle pi.

(6) What is the area of a circle?

The size of the plane surrounded by a circle is called the area of the circle.

(7) What is a department?

A figure surrounded by an arc and two radii passing through both ends of the arc is called a fan.

(8) What is an arc?

The part between two points on a circle is called an arc.

(9) What is the central angle?

The angle of the vertex on the center of the circle is called the central angle.

(10) What is a symmetric graph?

If a graph is folded in half along a straight line, the graphs on both sides can completely overlap, and such a graph is a symmetric graph.

53. What is a percentage?

A number indicating that one number is a percentage of another number is called a percentage, and a percentage is also called a percentage or a percentage.

54, proportion

(1) What is proportion?

Two expressions with equal ratios are called proportions.

(2) What is the proportional term?

The four numbers that make up a proportion are called proportional terms.

(3) What is a disproportionate term?

The two terms at both ends are called disproportionate terms.

(4) What is the proportional term?

The middle two terms are called proportional terms.

(5) What is the basic nature of proportion?

In proportion, the product of two external terms is equal to the product of two internal terms.

(6) What is the solution ratio?

The unknown term in finding the proportion is called the solution ratio.

(7) What is the direct proportional relationship?

Two related quantities, one variable and the other variable. If the ratio (that is, quotient) of the corresponding two numbers in these two quantities is certain, these two quantities are called proportional quantities, and the relationship between them is called proportional relationship.

(8) What is the inverse relationship?

Two related quantities, one variable and the other variable. If the corresponding product of these two quantities is certain, these two quantities are called inverse proportional quantities, and their relationship is inversely proportional.

55, cylinder

(1) What is the bottom surface of a cylinder?

The upper and lower surfaces of a cylinder are called the bottom surface of the cylinder.

(2) What is the side of a cylinder?

The surface of a cylinder is called the side of the cylinder.

(3) What is the height of the cylinder?

The distance between the two bottom surfaces of a cylinder is called the height of the cylinder.

Methods of learning mathematics

Recite concepts and formulas

Many students' understanding of the concept only stays on the surface of words, and they don't pay enough attention to the special situation of the concept. Reciting is not a rote memorization of concepts and formulas, but a connection with practical topics. In this way, the learned knowledge points can be well connected with problem solving.

See more examples

In the process of learning mathematics, we must look at more examples. Careful classmates will find that the teacher will always give us some extra-curricular examples or exercises after explaining the basic content. The concepts and theorems we learn are generally abstract. To concretize them, we need to apply them to the theme. We can concretize the existing concepts in our minds in the process of reading examples, thus making our understanding of knowledge more profound and thorough.

What is difference and difference in mathematics?

Difference is a mathematical operation, especially the result of subtracting two numbers. Sum refers to a new thing obtained by adding two or more things with the same nature, and can also be narrowly understood as the result of adding two numbers. Generation of sum: addend+addend = sum.