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Right to Left or “Breaking Down” Addition Strategy

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Addition strategy based on place value, from left to right.

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  • 1. Right to Left orBreaking Down
    Addition Strategy

2. Question:
Mrs. Ts class collected 458 dollars for charity.
Mr. Ys class collected 374 dollars.
What equation would tell us how much they collected in total?
Answer: 458 + 374 = ?
3. 458 + 374
Think about the place value of the digits.
Start with the hundreds, and add them.
458 has 4 hundreds.374 has three hundreds
400
300
400 + 300 = 700
4. 458 +374
400 + 300 = 700
458 has 5 tens 374 has 7 tens
50
70
50 + 70 = 120
5 tens + 7 tens = 12 tens
5. 458 + 374
So far we have done:
400 + 300 = 700
50 + 70 = 120
So what is left to do?
The ones!
458 has 8 ones.374 has 4 ones.
8 + 4 = 12
6. 458 + 374
We did:
Now we just add all the parts (in red).
400 + 300 = 700
50 + 70 = 120
8 + 4 = 12
700 + 120 = 820
Think: 700 + 100 = 800800 + 20 = 820
820 + 12 = 832
Think: 820 + 10 = 830 830 + 2 = 832
7. 458 + 374
458 + 374 = 832
8. You can do any order!
458 + 374 = _____
400 + 300 = 700
700 + 50 = 750
750 + 70 = 820
820 + 8 = 828
828 + 4 = 832
Always make sure you added all the parts!


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