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Right to Left or“Breaking Down” Addition Strategy
Question: Mrs. T’s class collected 458 dollars for charity.  Mr. Y’s class collected 374 dollars. What equation would tell us how much they collected in total? Answer: 458 + 374 = ?
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
458 +374 400 + 300 = 700 458 has 5 tens                     374 has 7 tens 50 70 50 + 70 = 120 5 tens + 7 tens = 12 tens
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
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 = 800              800 + 20 = 820 820 + 12 = 832 Think: 820 + 10 = 830             830 + 2 = 832
458 + 374 458 + 374 = 832
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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Right to left_strategy

  • 1. Right to Left or“Breaking Down” Addition Strategy
  • 2. Question: Mrs. T’s class collected 458 dollars for charity. Mr. Y’s 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 = 800 800 + 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!