Answers to math books in the 5th grade, and what are the contents of the math books in the first vol

Could you please tell me the answer to this question?

Grade 5 Mathematics Volume I Contents:1. Multiplication of decimals:

1. Multiply decimal numbers by whole numbers.

2. The approximate number of the product (rounded) is multiplied and added and subtracted.

3. Integer multiplication operations are generalized to decimal numbers (commutative property, distributive property and associative property).

2. Decimal division:

1. Divide the decimal by an integer.

2. The approximate number of quotients (rounded, note that the application questions should be based on the actual situation).

3. Observe objects (a brief understanding of the front, side and top views).

Fourth, the simple equation:

Equations of thought that letters represent numbers: Equations with unknowns are called equations. For example: 5x 32=47,6(a2) 47.

5. The area of the polygon:

1. The area of the parallelogram is ah.

2. The area of the triangle is ah 2.

3. Trapezoidal area (a b) h 2.

4. The area of the combined graph.

6. Statistics and Possibilities.

7. Mathematics wide angle.

8. Total review.

Summary of the contents of the first math book for the fifth grade:

1. Multiplication of decimals:

Multiply decimal by integer: (Calculate decimal multiplication by using the law of change in the product caused by the change of factors).

1. Calculate decimal addition: first align the decimal point, and then add the numbers on the same digit.

2. Calculate the alignment at the end of decimal multiplication, and calculate according to the integer multiplication rule. That is, the decimal multiplication calculation rule.

Multiply the whole number first, and then add a decimal point to the point.

To see how many decimal places there are in the factor, count the number from the right (or single digit) of the product and point to the decimal point.

When the number of decimal places of the product multiplied is not enough, it should be made up with 0 in front of it, and then the decimal point should be added.

3. Multiplication with 0 at the end of the decimal in the product: after calculating the product of the decimal multiplied by the integer, 0 appears at the end of the decimal of the product, and then the 0 at the end of the decimal should be removed according to the nature of the decimal. For example, it should be crossed out.

4. If the number of decimal places of the product multiplied is not enough, make up with 0 in front of it, and then point the decimal point. As.

Multiply decimal by decimal place.

1. The relationship between the number of decimal places in the factor and the product: there are several decimal places in the factor, and there are several decimal places in the product.

2. Calculate the product according to the integer multiplication method, and then add a decimal point to the product (see how many decimal places there are in the factor, output a few digits from the right side of the product, and point to the decimal point.) The number of decimal places of the product multiplied is not enough, so make up with 0 in front of the product, in the point decimal point.

Second, the law of operation.

1. Addition. Commutative law of addition: a+b=b+a.

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

2. Subtraction. Subtractive properties: a-b-c=a-(b+c) a-(b-c)=a-b+c.

3. Multiplication. Commutative law of multiplication: a b = b a.

Multiplicative associative law: (a b) c = a (b c).

Multiplicative distributive property: (a+b) c=a c+b c.

4. Division. Division properties: a b c = a (b c).

3. Decimal division.

1. The divisor is the decimal division calculation rule of the integer: the divisor is the decimal division of the integer, which is removed according to the principle of integer division, and the decimal point of the quotient should be aligned with the decimal point of the dividend; If there is still a remainder at the end of the dividend, add 0 to the remainder and continue dividing.

2. The divisor is the decimal division calculation rule of decimals: the divisor is the division of decimals, first move the decimal point of the divisor to make it an integer; The decimal point of the divisor is moved a few places to the right, and the decimal point of the dividend is also moved a few places to the right (if there are not enough digits, 0 is added at the end of the dividend), and then the decimal division is calculated according to the decimal division where the divisor is an integer.

3. Discoveries in decimal division:

When the divisor is greater than 1, the quotient is less than the dividend. As.

When the divisor is less than 1, the quotient is greater than the dividend. As.

The factor of 24 has ), and the factor of 38 has

The greatest common factor of 16 and 24 is (8, 24 and 38 are (

2), the greatest common factor of 16 and 38 is (2

2. Of the three numbers ) is the factor of (45), (45

is a multiple of and the greatest common factor of 9 is (3, and the least common multiple is (45

4. There is a two-digit 5, if it is a multiple of 5, you can fill in it). If it is a multiple of 3, you can fill in (0) if it is also a multiple of

Summary. Send the questions to the teacher to see<>

Send the questions to the teacher to see<>

Uh-huh. Solve according to the basic algorithm of the equation for your reference <> thank you. Five stars go one yo <>

Are these two questions?

Use the time spent to run the distance, and find out the time it takes to run 1 kilometer.

minutes) Uncle Li runs 1 km in an average of minutes.

The decimal point is one place to the right, which is to expand the decimal by 10 times, so as long as you divide it by 10, it is the original quotient.

The final dividend divided by the quotient is equal to the divisor. The divisor is.

Question 1 [

When the decimal point of the divisor is shifted to the right and expanded by 10 times, the quotient of the dividend is reduced by 10 times, so the quotient should be based on: divisor = dividend quotient This number should be.

You'd better type out the question, how can you get people to do it!