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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 360 · 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. 1.118 + 98 =
  2. 2.380 + 19 =
  3. 3.163 + 47 =
  4. 4.106 + 19 =
  5. 5.167 + 79 =
  6. 6.394 + 99 =
  7. 7.467 + 79 =
  8. 8.47 + 17 =
  9. 9.179 + 29 =
  10. 10.55 + 59 =
  11. 11.451 + 18 =
  12. 12.290 + 17 =
  13. 13.82 + 49 =
  14. 14.139 + 69 =
  15. 15.118 + 59 =
  16. 16.497 + 37 =
  17. 17.301 + 89 =
  18. 18.103 + 77 =
  19. 19.301 + 89 =
  20. 20.280 + 57 =
  21. 21.130 + 17 =
  22. 22.255 + 99 =
  23. 23.165 + 59 =
  24. 24.352 + 67 =
  25. 25.476 + 19 =
  26. 26.464 + 97 =
  27. 27.485 + 17 =
  28. 28.270 + 47 =
  29. 29.53 + 18 =
  30. 30.461 + 99 =
  31. 31.429 + 97 =
  32. 32.103 + 68 =
  33. 33.325 + 87 =
  34. 34.106 + 98 =
  35. 35.374 + 98 =
  36. 36.194 + 39 =
  37. 37.210 + 67 =
  38. 38.81 + 88 =
  39. 39.405 + 79 =
  40. 40.294 + 77 =

Answer key

  1. 216
  2. 399
  3. 210
  4. 125
  5. 246
  6. 493
  7. 546
  8. 64
  9. 208
  10. 114
  11. 469
  12. 307
  13. 131
  14. 208
  15. 177
  16. 534
  17. 390
  18. 180
  19. 390
  20. 337
  21. 147
  22. 354
  23. 224
  24. 419
  25. 495
  26. 561
  27. 502
  28. 317
  29. 71
  30. 560
  31. 526
  32. 171
  33. 412
  34. 204
  35. 472
  36. 233
  37. 277
  38. 169
  39. 484
  40. 371

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