"Mixed Operations of Addition and Subtraction" PPT courseware for subtraction within 20

Description

"Mixed Operations of Addition and Subtraction" PPT courseware for subtraction within 20

teaching objectives

1. Learn the mixed calculation method of addition and subtraction in the process of looking at pictures, telling stories, and doing calculations by yourself.

2. Understand the mixed calculation formulas of addition and subtraction, and be able to correctly perform mixed calculations of addition and subtraction.

3. Able to discover mathematical problems in situations, ask simple mathematical questions and answer them.

review review

12-5-3= 16-8-4=

18-5-6= 15-4-3=

16-9-3= 19-9-5=

How many bread did Little Bear buy?

6 more loaves came.

5+6=11

I buy 8 loaves.

11-8＝3

Give me the rest.

Like 5+6-8, an operation form that contains both addition and subtraction is called a mixed operation of addition and subtraction.

In conclusion

When calculating the mixed operation of addition and subtraction, the calculation should be carried out from left to right. First, calculate the result of the first step, and then use the result of the first step to calculate the second step.

practice

1. Look at the diagram and calculate.

There are 11 people in the car now.

After 2 people get off the bus and 3 people get on the bus, how many people are in the bus?

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

3. See who can count faster.

6+4-3= 3+3+4=

8-3-5= 7-2-3 =

7-6+6= 5+5-0=

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Update Time: 2024-09-26

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

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