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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 683 · 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. 1.85 + 27 =
  2. 2.362 + 49 =
  3. 3.185 + 19 =
  4. 4.456 + 68 =
  5. 5.230 + 29 =
  6. 6.301 + 29 =
  7. 7.326 + 49 =
  8. 8.156 + 68 =
  9. 9.134 + 69 =
  10. 10.62 + 78 =
  11. 11.122 + 67 =
  12. 12.81 + 38 =
  13. 13.328 + 57 =
  14. 14.68 + 39 =
  15. 15.162 + 17 =
  16. 16.292 + 27 =
  17. 17.499 + 99 =
  18. 18.453 + 59 =
  19. 19.175 + 59 =
  20. 20.284 + 48 =
  21. 21.57 + 28 =
  22. 22.266 + 68 =
  23. 23.65 + 69 =
  24. 24.460 + 77 =
  25. 25.91 + 37 =
  26. 26.367 + 77 =
  27. 27.56 + 28 =
  28. 28.376 + 57 =
  29. 29.99 + 28 =
  30. 30.431 + 87 =
  31. 31.368 + 28 =
  32. 32.266 + 37 =
  33. 33.144 + 88 =
  34. 34.485 + 28 =
  35. 35.44 + 68 =
  36. 36.333 + 48 =
  37. 37.222 + 79 =
  38. 38.305 + 57 =
  39. 39.189 + 39 =
  40. 40.453 + 28 =

Answer key

  1. 112
  2. 411
  3. 204
  4. 524
  5. 259
  6. 330
  7. 375
  8. 224
  9. 203
  10. 140
  11. 189
  12. 119
  13. 385
  14. 107
  15. 179
  16. 319
  17. 598
  18. 512
  19. 234
  20. 332
  21. 85
  22. 334
  23. 134
  24. 537
  25. 128
  26. 444
  27. 84
  28. 433
  29. 127
  30. 518
  31. 396
  32. 303
  33. 232
  34. 513
  35. 112
  36. 381
  37. 301
  38. 362
  39. 228
  40. 481

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