Checking Addition with Estimation
Instructions: For each problem, round the numbers to the nearest ten or hundred (as shown), estimate the answer, then calculate the exact answer. Check if your exact answer is close to your estimate! ✓
Part A: Round to the Nearest 10
1. 47 + 32
Round: 47 → ________ and 32 → ________
Estimated sum: ________ + ________ = ________
Exact answer: 47 + 32 = ________
2. 83 + 54
Round: 83 → ________ and 54 → ________
Estimated sum: ________ + ________ = ________
Exact answer: 83 + 54 = ________
3. 126 + 68
Round: 126 → ________ and 68 → ________
Estimated sum: ________ + ________ = ________
Exact answer: 126 + 68 = ________
Part B: Round to the Nearest 100
4. 347 + 289
Round: 347 → ________ and 289 → ________
Estimated sum: ________ + ________ = ________
Exact answer: 347 + 289 = ________
5. 562 + 431
Round: 562 → ________ and 431 → ________
Estimated sum: ________ + ________ = ________
Exact answer: 562 + 431 = ________
6. 718 + 395
Round: 718 → ________ and 395 → ________
Estimated sum: ________ + ________ = ________
Exact answer: 718 + 395 = ________
Part C: Challenge - Check the Work!
Someone calculated these answers. Use estimation to check if they are reasonable. Circle Reasonable or Unreasonable.
7. 64 + 58 = 122 Reasonable / Unreasonable
8. 235 + 487 = 622 Reasonable / Unreasonable
9. 149 + 356 = 605 Reasonable / Unreasonable