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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 635 · 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. 1.420 + 47 =
  2. 2.209 + 18 =
  3. 3.78 + 37 =
  4. 4.28 + 47 =
  5. 5.495 + 19 =
  6. 6.88 + 49 =
  7. 7.319 + 17 =
  8. 8.102 + 18 =
  9. 9.278 + 38 =
  10. 10.480 + 38 =
  11. 11.458 + 69 =
  12. 12.163 + 27 =
  13. 13.117 + 27 =
  14. 14.245 + 97 =
  15. 15.371 + 17 =
  16. 16.474 + 17 =
  17. 17.407 + 97 =
  18. 18.224 + 88 =
  19. 19.382 + 68 =
  20. 20.175 + 69 =
  21. 21.266 + 28 =
  22. 22.462 + 98 =
  23. 23.459 + 88 =
  24. 24.408 + 88 =
  25. 25.370 + 27 =
  26. 26.349 + 18 =
  27. 27.214 + 28 =
  28. 28.36 + 27 =
  29. 29.254 + 49 =
  30. 30.213 + 89 =
  31. 31.94 + 19 =
  32. 32.135 + 78 =
  33. 33.342 + 39 =
  34. 34.321 + 79 =
  35. 35.114 + 97 =
  36. 36.475 + 97 =
  37. 37.65 + 29 =
  38. 38.74 + 89 =
  39. 39.158 + 59 =
  40. 40.103 + 49 =

Answer key

  1. 467
  2. 227
  3. 115
  4. 75
  5. 514
  6. 137
  7. 336
  8. 120
  9. 316
  10. 518
  11. 527
  12. 190
  13. 144
  14. 342
  15. 388
  16. 491
  17. 504
  18. 312
  19. 450
  20. 244
  21. 294
  22. 560
  23. 547
  24. 496
  25. 397
  26. 367
  27. 242
  28. 63
  29. 303
  30. 302
  31. 113
  32. 213
  33. 381
  34. 400
  35. 211
  36. 572
  37. 94
  38. 163
  39. 217
  40. 152

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