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Authoritative PPT Summary
"Addition, Subtraction and Mixing" PPT courseware
1. Fill in the blanks.
1. When doing addition and subtraction in writing, the same digits must be ( ),
Start by adding and subtracting from the ones digit.
If the two digits add up to ten, advance to the tens digit ( ). If a
If the number is not reduced enough, it will be moved back from the tens position ( ).
2. Vertical calculation.
36+28+17= 65-25-21＝
Consolidation exercises.
1. Use vertical calculation.
52＋29－38＝ 65－28＋17＝
The Stars Chorus originally had 52 members. Nine students have graduated and 15 new members have joined. How many members are there now?
Class summary:
In the vertical position, the same digits must be aligned, if there is not enough subtraction, they must step aside, and if the sum reaches ten, they must carry.
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