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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 403 · 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. 1.180 + 39 =
  2. 2.496 + 57 =
  3. 3.61 + 97 =
  4. 4.32 + 27 =
  5. 5.314 + 68 =
  6. 6.395 + 97 =
  7. 7.62 + 67 =
  8. 8.131 + 17 =
  9. 9.80 + 59 =
  10. 10.292 + 58 =
  11. 11.401 + 39 =
  12. 12.333 + 98 =
  13. 13.74 + 38 =
  14. 14.70 + 37 =
  15. 15.335 + 29 =
  16. 16.121 + 68 =
  17. 17.433 + 89 =
  18. 18.129 + 99 =
  19. 19.59 + 38 =
  20. 20.294 + 87 =
  21. 21.208 + 39 =
  22. 22.79 + 37 =
  23. 23.196 + 17 =
  24. 24.375 + 38 =
  25. 25.489 + 77 =
  26. 26.482 + 17 =
  27. 27.101 + 69 =
  28. 28.107 + 39 =
  29. 29.311 + 19 =
  30. 30.349 + 89 =
  31. 31.104 + 27 =
  32. 32.477 + 67 =
  33. 33.379 + 27 =
  34. 34.499 + 58 =
  35. 35.145 + 39 =
  36. 36.112 + 27 =
  37. 37.257 + 37 =
  38. 38.364 + 99 =
  39. 39.425 + 87 =
  40. 40.407 + 47 =

Answer key

  1. 219
  2. 553
  3. 158
  4. 59
  5. 382
  6. 492
  7. 129
  8. 148
  9. 139
  10. 350
  11. 440
  12. 431
  13. 112
  14. 107
  15. 364
  16. 189
  17. 522
  18. 228
  19. 97
  20. 381
  21. 247
  22. 116
  23. 213
  24. 413
  25. 566
  26. 499
  27. 170
  28. 146
  29. 330
  30. 438
  31. 131
  32. 544
  33. 406
  34. 557
  35. 184
  36. 139
  37. 294
  38. 463
  39. 512
  40. 454

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