"Mixed Operations of Addition and Subtraction" PPT Courseware 2

Description

"Mixed Operations of Addition and Subtraction" PPT Courseware 2

Calculation method:

The class held a shuttlecock kicking competition, and the results were as follows:

Can you calculate how many kicks the three of them took in total?

21＋37＋31＝

Let me know how you calculated it.

20＋30＋30＝80(Part 2)

1+7+1=9 (Part 2)

80＋9＝89 (Part 2)

Method summary

method one:

First, add the tens digits to get a result; then add the units digits to get the result; and finally add the two results to get the answer.

Method Two:

Direct vertical addition: calculate the units digit first, then calculate the tens digit.

Method three:

Add from left to right: add the first two numbers to the sum and add the third number.

Compete to see who can calculate faster and more accurately!

45＋26＋4＝ 29＋24＋10＝

72+7+12＝ 55+18+1＝

23+41+15＝ 7+26+4＝

35＋30＋28＝ 37＋29＋13＝

14＋39＋8＝ 24＋45＋25＝

45＋10＋18＝ 32＋17＋15＝

Tell me, what should you do when doing addition and subtraction calculations?

When writing vertically

Align the same digits, starting from the ones digit;

If the total adds up to ten, it must be carried forward; if it is not enough to subtract, it must be stepped down;

Sometimes you can use simple writing.

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Update Time: 2024-10-18

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

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