"Continuous Subtraction" PPT courseware for subtraction within 20

Description

"Continuous Subtraction" PPT courseware for subtraction within 20

teaching objectives

1. Understand the meaning of continuous subtraction and learn the calculation method of continuous subtraction in the process of looking at pictures, telling stories and doing column calculations.

2. Understand the continuous subtraction formula and be able to perform calculations related to continuous subtraction.

3. Feel the fun of learning mathematics in the process of solving problems and realize the wide application of mathematics in life.

review review

11－5= 16－8= 14－5=

18－8= 15－4= 13－8=

16－9= 19－9= 17－9=

How many more letters does Little Bear have to send?

Can 14-6=8 and 8-3=5 be put into a formula?

14-6-3 =5

An arithmetic has two minus signs in it, that is, two consecutive numbers are subtracted from the total. The subtraction algorithm for continuous subtraction like this is called continuous subtraction.

In conclusion

1. Continuous subtraction is the continuous subtraction of 3 or more numbers.

2. When calculating continuous subtraction formulas, calculate in order from left to right. First subtract the first two numbers, and then subtract the third number from the obtained number.

practice

1. How many pictures does Congcong have?

18-6-4=8

2. Look at the picture and fill in the form.

3. The kindergarten bought 20 rubber balls and divided them into 5 for the small class and 7 for the middle class. How many classes are divided into?

Give the rest to the big class.

20-5-7=8

4. See who can count faster.

12-3-5= 15-7-4=

18-6-8= 17-6-9 =

19-9-8= 15-3-4=

Knowledge and memory

Calculate consecutive subtraction problems in order from left to right.

Calculate carefully step by step and check the correct questions repeatedly.

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For more information about the PPT courseware "Subtraction Within 20 Consecutive Subtractions", please click on the Subtraction PPT tab of Consecutive Subtraction Within 20 PPT.

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Update Time: 2024-10-02

This template belongs to Mathematics courseware Hebei Education Edition First Grade Mathematics Volume 1 industry PPT template

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