"Continuous Addition and Consecutive Subtraction" PPT courseware on addition and subtraction within 100

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"Continuous Addition and Consecutive Subtraction" PPT courseware on addition and subtraction within 100

1. Column vertical calculation

What should you pay attention to when doing addition and subtraction in writing?

Same digit ( )

When the unit digits add up to ten, go to ( )

The single digit is not reduced enough, ( )

2. Calculate the following questions orally and tell us in what order you calculated them.

10+10+10= 6+4+5=

60-20-30= 16-8-4=

19+27+26=□( )

Thinking: What to count first when making vertical formulas? What else?

After completing it independently, the group discussed how else to write the vertical style?

Come and give it a try:

90-25-28=( )

Requirement: Make your own vertical calculations. Can you write two vertical forms together?

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Update Time: 2024-09-09

This template belongs to Mathematics courseware Jiangsu Education Edition Second Grade Mathematics Volume 1 industry PPT template

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