Sum-addendum = addendum product/coefficient = coefficient
Minus-Minus = Differential Divider/Divider = Quotient
Negative difference = negative dividend = divisor
Subtraction+difference = minuend × quotient = dividend
2. separator >; Remainder divisor × quotient+remainder = dividend divisor × quotient = dividend-remainder
The figure composed of two rays drawn from a point is called an angle.
A corner has a vertex and two straight sides.
A triangular ruler has three angles, one of which is a right angle.
4. Features of Cubes and Cubes
* * * Similarity: Cubes and cuboids have 6 faces, 12 sides and 8 vertices.
Difference: All six sides of a cube are squares.
A cuboid has six faces, all of which are rectangular, or two opposite faces may be square.
The 12 sides of a cube are all equal.
The 12 edges of a cuboid are not all equal. The 12 sides of a cuboid can be divided into three groups, each with four sides of equal length, or into two groups, one with four sides of equal length and the other with eight sides of equal length.
Relationship: Cubes are special cuboids.
5. It takes at least 8 small cubes to form a big cube.
6. The characteristics of squares and rectangles
* * * Similarity: Both a square and a rectangle have four sides, four right angles, and the opposite sides are equal.
Difference: Four sides of a square are equal, or adjacent sides are equal.
The opposite sides of a rectangle are equal.
Relationship: Square is a special rectangle.
7. At least four small squares can form a big square.
8. A square number or four times a square number.
The sum of consecutive odd numbers starting from 1 is a square number.
9. Multiply one factor by several and divide another factor by several, and the product remains unchanged.
10. Multiply any number with 10, just add 1 zero at the end of this number.
1 1. Multiply any number by 0, and the product will get 0.
Divide 0 by any number that is not equal to 0, and the quotient is 0, so 0 cannot be divided.