Let’s go through each problem one by one.
For each, we’ll:
1. Estimate the sum or difference (round numbers to make them easier).
2. Calculate the actual answer.
3. Compare how close the estimate was.
---
Problem 1: 45 + 37
Estimate:
45 → 50
37 → 40
Estimated sum = 50 + 40 =
90
Actual:
45 + 37 =
82
Difference between estimate and actual: 90 - 82 = 8 — pretty close!
---
Problem 2: 372 + 439
Estimate:
Round to nearest hundred:
372 → 400
439 → 400
Estimated sum = 400 + 400 =
800
Actual:
372 + 439 =
811
Difference: 811 - 800 = 11 — very close!
*(Alternatively, rounding to tens: 370 + 440 = 810 — even closer!)*
---
Problem 3: 409 + 379
Estimate:
409 → 400
379 → 400
Estimated sum = 400 + 400 =
800
Actual:
409 + 379 =
788
Difference: 800 - 788 = 12 — good estimate!
---
Problem 4: 825 + 199
Estimate:
825 → 800
199 → 200
Estimated sum = 800 + 200 =
1000
Actual:
825 + 199 =
1024
Difference: 1024 - 1000 = 24 — still reasonable for estimation.
---
Problem 5: 941 + 458
Estimate:
941 → 900
458 → 500
Estimated sum = 900 + 500 =
1400
Actual:
941 + 458 =
1399
Wow — only off by 1! That’s super accurate.
---
Problem 6: 68 - 24
Estimate:
68 → 70
24 → 20
Estimated difference = 70 - 20 =
50
Actual:
68 - 24 =
44
Difference: 50 - 44 = 6 — decent estimate.
---
Problem 7: 296 - 152
Estimate:
296 → 300
152 → 150
Estimated difference = 300 - 150 =
150
Actual:
296 - 152 =
144
Difference: 150 - 144 = 6 — nice job estimating!
---
Problem 8: 582 - 326
Estimate:
582 → 600
326 → 300
Estimated difference = 600 - 300 =
300
Actual:
582 - 326 =
256
Difference: 300 - 256 = 44 — a bit high, but okay for rough estimate.
*(Better estimate: 580 - 330 = 250 — much closer!)*
---
Problem 9: 819 - 539
Estimate:
819 → 800
539 → 500
Estimated difference = 800 - 500 =
300
Actual:
819 - 539 =
280
Difference: 300 - 280 = 20 — acceptable.
*(Tighter estimate: 820 - 540 = 280 — perfect!)*
---
Problem 10: 947 - 533
Estimate:
947 → 900
533 → 500
Estimated difference = 900 - 500 =
400
Actual:
947 - 533 =
414
Difference: 414 - 400 = 14 — pretty good.
*(Better: 950 - 530 = 420 — also close.)*
---
Final Answer:
All problems solved with estimates and actual answers calculated as shown above. Since no specific output format was requested beyond solving, here is a summary of all actual answers:
1. 82
2. 811
3. 788
4. 1024
5. 1399
6. 44
7. 144
8. 256
9. 280
10. 414
Parent Tip: Review the logic above to help your child master the concept of estimating sums and differences worksheets.
