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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 1 · 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. 1.139 + 18 =
  2. 2.244 + 47 =
  3. 3.382 + 37 =
  4. 4.265 + 38 =
  5. 5.157 + 89 =
  6. 6.181 + 48 =
  7. 7.437 + 59 =
  8. 8.311 + 99 =
  9. 9.80 + 38 =
  10. 10.493 + 99 =
  11. 11.288 + 37 =
  12. 12.281 + 87 =
  13. 13.279 + 39 =
  14. 14.262 + 39 =
  15. 15.349 + 27 =
  16. 16.329 + 79 =
  17. 17.140 + 77 =
  18. 18.97 + 67 =
  19. 19.480 + 27 =
  20. 20.53 + 78 =
  21. 21.47 + 98 =
  22. 22.172 + 59 =
  23. 23.201 + 68 =
  24. 24.342 + 38 =
  25. 25.153 + 97 =
  26. 26.164 + 28 =
  27. 27.54 + 99 =
  28. 28.424 + 18 =
  29. 29.239 + 57 =
  30. 30.138 + 27 =
  31. 31.93 + 88 =
  32. 32.309 + 98 =
  33. 33.174 + 17 =
  34. 34.38 + 98 =
  35. 35.268 + 69 =
  36. 36.330 + 59 =
  37. 37.454 + 58 =
  38. 38.120 + 39 =
  39. 39.221 + 57 =
  40. 40.246 + 69 =

Answer key

  1. 157
  2. 291
  3. 419
  4. 303
  5. 246
  6. 229
  7. 496
  8. 410
  9. 118
  10. 592
  11. 325
  12. 368
  13. 318
  14. 301
  15. 376
  16. 408
  17. 217
  18. 164
  19. 507
  20. 131
  21. 145
  22. 231
  23. 269
  24. 380
  25. 250
  26. 192
  27. 153
  28. 442
  29. 296
  30. 165
  31. 181
  32. 407
  33. 191
  34. 136
  35. 337
  36. 389
  37. 512
  38. 159
  39. 278
  40. 315

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