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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 622 · 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. 1.169 + 88 =
  2. 2.337 + 68 =
  3. 3.381 + 88 =
  4. 4.155 + 28 =
  5. 5.398 + 59 =
  6. 6.115 + 67 =
  7. 7.217 + 98 =
  8. 8.252 + 37 =
  9. 9.328 + 28 =
  10. 10.253 + 49 =
  11. 11.422 + 98 =
  12. 12.361 + 38 =
  13. 13.95 + 68 =
  14. 14.234 + 17 =
  15. 15.204 + 49 =
  16. 16.456 + 28 =
  17. 17.158 + 17 =
  18. 18.240 + 48 =
  19. 19.471 + 67 =
  20. 20.145 + 79 =
  21. 21.415 + 27 =
  22. 22.68 + 79 =
  23. 23.88 + 39 =
  24. 24.282 + 57 =
  25. 25.323 + 97 =
  26. 26.165 + 99 =
  27. 27.165 + 57 =
  28. 28.85 + 97 =
  29. 29.94 + 88 =
  30. 30.417 + 77 =
  31. 31.422 + 87 =
  32. 32.142 + 78 =
  33. 33.118 + 17 =
  34. 34.70 + 28 =
  35. 35.247 + 29 =
  36. 36.481 + 48 =
  37. 37.173 + 57 =
  38. 38.69 + 88 =
  39. 39.229 + 67 =
  40. 40.178 + 67 =

Answer key

  1. 257
  2. 405
  3. 469
  4. 183
  5. 457
  6. 182
  7. 315
  8. 289
  9. 356
  10. 302
  11. 520
  12. 399
  13. 163
  14. 251
  15. 253
  16. 484
  17. 175
  18. 288
  19. 538
  20. 224
  21. 442
  22. 147
  23. 127
  24. 339
  25. 420
  26. 264
  27. 222
  28. 182
  29. 182
  30. 494
  31. 509
  32. 220
  33. 135
  34. 98
  35. 276
  36. 529
  37. 230
  38. 157
  39. 296
  40. 245

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