1L = 1000ml = 1000 cm3

One meter (m)= 100 cm 1 decimeter = 10 cm10 mm.

Student: Note that "cm" is generally called "cm" in daily life. ( 1 cm ≈ 1 cm)？

δ:a×a = a2？ a×a×a=a3

500g= 1 kg？ 1kg=2 kg？ 1000g= 1kg？ 1 ton = 1000 kg

One meter = 100 cm 1 decimeter = 10 cm? 1 cm = 10 mm？ 1 decimeter = 100 mm

1 Li = 500m?

1 km = 1000 m？ 1km = 1000 m1yuan =10? 1 angle = 10 minute?

1 year =365 days (average year) =366 days (leap year)?

1 hour (hour) =60 minutes 1 day =24 hours

Additive commutative law: a+b=b+a?

Additive associative law: a+b+c=a+(b+c)

Distribution law of multiplication: (a+b)×? c=a×b+b×c？

Law of multiplicative association: (a-b)×? c=a×c-b×c？

Multiplicative commutative law: a×b=b×a?

Law of multiplicative association: (a? ×b)×？ c=a×(b×c)

1:

Number of copies × number of copies = number of people

Number of people per copy = number of copies.

Number of people/number of copies = number of copies.

2:

1 multiple × multiple = multiple

Multiply1Multiply = Multiply

Multiply/Multiply = 1 Multiply

3:

Speed × time = travel

Travel speed = time

Travel time = speed

4:

Unit price × quantity = total price

Total price/unit price = quantity

Total price/quantity = unit price

5:

Work efficiency × working hours = total output of work.

Total work output ÷ work efficiency = working hours?

Total output of work ÷ working time = working efficiency

6:

Appendix+Appendix = Sum

And-one addend = another addend?

7:

Negative-negative = difference

Negative difference = negative

Difference+Minus = Minus

8:

Factor × factor = product

Product? ÷? One factor = another factor?

9:

Dividend = quotient

Dividend = divisor

Quotient × Divider = Divider?

What is the formula for calculating the pattern of mathematics subjects in primary schools?

1:

Square? C: circumference? Student: Area? A: Side length

Perimeter = side length ×4?

C=4×a

Area = side length × side length

S=a×a

2: Cube? V: volume? A: Edge length

Surface area = side length × side length ×6

S table =a×a×6? Volume = side length × side length × side length

V=a×a×a

3: Rectangular? C: circumference? Student: Area? A: Side length

Circumference = (length and width) ×2?

C=2×(a b)？ Area = length × width

S=a×b

4: cuboid? V: volume s: area a: length? B: Width? H: high?

(1) surface area = (length× width× length× height× width× height) × 2

S=2×(a×b a×h b×h)？

(2) Volume = length × width × height? V=a×b×h？

5: Triangle? S: area a: bottom h: height.

Area = bottom × height ÷2?

S=a×h÷2？ Height of triangle = area ×2÷ base.

Triangle base = area ×2÷ height

6: parallelogram? S: area a: bottom h: height.

Area = bottom× height S=a×h

7: trapezoid? Student: Area? At the bottom? B: Ass? tall

Area = (upper bottom and lower bottom) × height ÷2

S=(a b)×? h \u 2

▲8: Round?

Student: Area? C: circumference ∏d= diameter? R= radius?

(1) circumference = diameter ×∏=2×∏× radius

C=∏d=2∏r？ (2) area = radius × radius× ∏?

▲9: Cylinder?

V: volume? H: high? Student: The bottom area? R: bottom radius? C: bottom circumference?

(1) lateral area = bottom circumference × height.

(2) Surface area = lateral area bottom area ×2

(3) Volume = bottom area × height

(4) Volume = lateral area ÷2× radius.

▲ 10:? A cone?

V: volume? H: high? Student: The bottom area? R: bottom radius

Volume = bottom area × height ÷3

V=S bottom area× h×1/3

Number of people/total number of copies = average

▲ Formula of sum and difference problem? (sum+difference) ÷ 2 = large number

(sum-difference) ÷ 2 = decimal

▲ Is there a problem? With what? Difference problem? And ÷ (multiple-1) = decimal

Decimal × multiple = large number (or? And-decimal = large number)? Difference ÷ (multiple-1) = decimal

Decimal × multiple = large number (or? Decimal+difference = large number)?

▲ Multiples and factors?

0 is a natural number. Among natural numbers, the smallest even number is 0 and the smallest odd number is 1. ? The smallest multiple of a number is equal to its largest factor. ?

The minimum multiple of a number is itself, and there is no maximum multiple. The multiple of a number is infinite. ? The smallest factor of a number is 1, and the largest factor is itself. The number of factors of a number is limited. ? What is an even number? Numbers that are multiples of 2 are called even numbers. The number divisible by 2 is even. What is an odd number? Numbers that are not multiples of 2 are called odd numbers. Is the number that is not divisible by 2 odd? A multiple of 2, and the numbers in the unit are 2, 4, 6, 8 and 0. A multiple of 2 is an even number. ?

A multiple of 5, and the numbers in the unit are 5 and 0. ? The unit of 0 is a multiple of 2 and 5. ? A multiple of 3, the sum of the above numbers must be a multiple of 3. ?

Note: the multiple of 4 must be a multiple of 2, and the multiple of 2 is not necessarily a multiple of 4. ?

What is prime number (or prime number)? Only 1 and its two factors are called prime numbers. ? What is a composite number? There are other factors besides 1 and itself, which are called composite numbers. ? Note: the factor of 1 is only 1 (yes 1). 1 is neither prime nor composite. The smallest prime number is 2 and the smallest composite number is 4. There is no maximum prime number and composite number. ?