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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 36 · 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. 1.80 + 58 =
  2. 2.483 + 48 =
  3. 3.258 + 48 =
  4. 4.493 + 28 =
  5. 5.481 + 27 =
  6. 6.311 + 19 =
  7. 7.298 + 98 =
  8. 8.244 + 17 =
  9. 9.115 + 29 =
  10. 10.274 + 67 =
  11. 11.159 + 39 =
  12. 12.242 + 88 =
  13. 13.108 + 38 =
  14. 14.128 + 88 =
  15. 15.271 + 27 =
  16. 16.295 + 39 =
  17. 17.73 + 89 =
  18. 18.285 + 69 =
  19. 19.106 + 67 =
  20. 20.461 + 17 =
  21. 21.41 + 68 =
  22. 22.349 + 97 =
  23. 23.270 + 59 =
  24. 24.476 + 99 =
  25. 25.457 + 69 =
  26. 26.53 + 38 =
  27. 27.128 + 89 =
  28. 28.316 + 38 =
  29. 29.378 + 18 =
  30. 30.234 + 27 =
  31. 31.408 + 79 =
  32. 32.277 + 89 =
  33. 33.164 + 38 =
  34. 34.86 + 17 =
  35. 35.193 + 68 =
  36. 36.350 + 37 =
  37. 37.429 + 68 =
  38. 38.432 + 48 =
  39. 39.452 + 98 =
  40. 40.404 + 58 =

Answer key

  1. 138
  2. 531
  3. 306
  4. 521
  5. 508
  6. 330
  7. 396
  8. 261
  9. 144
  10. 341
  11. 198
  12. 330
  13. 146
  14. 216
  15. 298
  16. 334
  17. 162
  18. 354
  19. 173
  20. 478
  21. 109
  22. 446
  23. 329
  24. 575
  25. 526
  26. 91
  27. 217
  28. 354
  29. 396
  30. 261
  31. 487
  32. 366
  33. 202
  34. 103
  35. 261
  36. 387
  37. 497
  38. 480
  39. 550
  40. 462

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