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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 855 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.353 + 28 =
  2. 2.274 + 27 =
  3. 3.472 + 77 =
  4. 4.203 + 89 =
  5. 5.322 + 49 =
  6. 6.46 + 27 =
  7. 7.211 + 28 =
  8. 8.420 + 47 =
  9. 9.460 + 79 =
  10. 10.448 + 38 =
  11. 11.495 + 99 =
  12. 12.317 + 48 =
  13. 13.348 + 19 =
  14. 14.139 + 48 =
  15. 15.205 + 27 =
  16. 16.431 + 29 =
  17. 17.35 + 79 =
  18. 18.223 + 79 =
  19. 19.374 + 69 =
  20. 20.204 + 27 =
  21. 21.49 + 57 =
  22. 22.294 + 37 =
  23. 23.207 + 37 =
  24. 24.57 + 69 =
  25. 25.428 + 19 =
  26. 26.98 + 68 =
  27. 27.358 + 88 =
  28. 28.109 + 88 =
  29. 29.202 + 48 =
  30. 30.402 + 27 =
  31. 31.145 + 29 =
  32. 32.303 + 89 =
  33. 33.240 + 99 =
  34. 34.323 + 87 =
  35. 35.142 + 58 =
  36. 36.445 + 89 =
  37. 37.342 + 39 =
  38. 38.126 + 38 =
  39. 39.115 + 68 =
  40. 40.286 + 17 =

Answer key

  1. 381
  2. 301
  3. 549
  4. 292
  5. 371
  6. 73
  7. 239
  8. 467
  9. 539
  10. 486
  11. 594
  12. 365
  13. 367
  14. 187
  15. 232
  16. 460
  17. 114
  18. 302
  19. 443
  20. 231
  21. 106
  22. 331
  23. 244
  24. 126
  25. 447
  26. 166
  27. 446
  28. 197
  29. 250
  30. 429
  31. 174
  32. 392
  33. 339
  34. 410
  35. 200
  36. 534
  37. 381
  38. 164
  39. 183
  40. 303

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