"Harvest Season" PPT Courseware 4

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"Harvest Season" PPT Courseware 4

Think about it: What is the maximum number that can be filled in ( )?

40×( )＜316 90×( )＜643

50×( )＜408 80×( )＜505

Division rules when the divisor is a two-digit number

1. Starting from the ( ) digit of the dividend, first use the first ( ) digit of the divisor. If it is smaller than the divisor, try dividing the first ( ) digit again.

2. Which digit of the dividend is divided into, write ( ) on that digit.

3. Every time a quotient is found, the remaining number must be less than the divisor ( ).

summary

The divisor is a two-digit division. You need to divide from the high digit. First use the divisor to divide the first two digits of the dividend. Write the quotient on the digit of the dividend you reach. The remaining number after each division must be greater than small divisor

think about it

What are the similarities in calculation methods between division with a two-digit divisor and division with a one-digit divisor? What's the difference?

Division rules where the divisor is a single digit

1. Starting from the highest digit of the dividend, divide the previous digit of the dividend with the divisor each time. If it is smaller than the divisor, try dividing the first two digits again.

2. Write the quotient on the digit of the dividend you divide.

3. Every time a quotient is found, the remaining number must be smaller than the divisor.

Same point:

1. Divide from the high digit of the dividend;

2. Write the quotient on the digit of the dividend you divide into;

3. The remainder of each division must be smaller than the divisor.

difference:

When the divisor is a two-digit division, when trying to divide, first try to divide the first two or first three digits of the dividend; when the divisor is a one-digit division, first try to divide the first digit or the first two digits of the dividend.

Think about the property that the quotient does not change during division, and then fill in the blanks based on the property that the quotient does not change.

The property of constant quotient: the dividend and divisor expand or shrink by the same multiple at the same time, the quotient remains unchanged, and the remainder also expands or shrinks by the same multiple.

The division formula a÷b=9...11, if the dividend and divisor are expanded by 3 times at the same time, the quotient is ( ) and the remainder is ( ).

The division formula a÷b=9...10. If the dividend and the divisor are reduced by 2 times at the same time, the quotient is ( ) and the remainder is ( ).

The division formula a÷b=9, if the dividend is expanded by 10 times and the divisor is reduced by 10 times, the quotient is ( ).

judge

1. When calculating division, the remainder must be smaller than the divisor. ( )

2. The quotient of dividing two numbers is 36. If the dividend decreases by 10, the divisor also decreases by 10, and the quotient remains unchanged. ( )

3. If a number is 3 times 50, then the number is 5 times 30. ( )

4. In division calculations, the remaining number cannot be larger than the divisor each time. ( )

fill in the blank

The quotient of 480÷20 is calculated as ( ) digits, and the highest digit is ( ) digits.

The quotient of a three-digit number divided by a two-digit number may be ( ) digits or ( ) digits.

To make the quotient of 46÷67 a two-digit number, the minimum number in the box can be ( ). To make the quotient be one digit, the maximum number ( ) can be filled in the box.

Application questions

1. It took Xiaoqiang 12 minutes to go directly from home to the cinema. How many minutes would it take for him to walk from home to the cinema via the library at the same speed?

2. The fruit shop delivered 23 baskets of pears and sold them for a total of 598 yuan.

(1) How much is the average price of a basket of pears?

(2) Due to the price drop, the price of each basket of pears has dropped to half of its original price. If 23 baskets of pears are sold now, how many yuan can they be sold for?

3. It takes 64 sheets of paper to bind a notebook. The existing 900 sheets of paper need to be bound to bind 15 such notebooks. Is this enough?

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Update Time: 2024-11-21

This template belongs to Mathematics courseware Qingdao Edition Fourth Grade Mathematics Volume 1 industry PPT template

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