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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 17 · 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. 1.130 + 27 =
  2. 2.354 + 28 =
  3. 3.273 + 48 =
  4. 4.337 + 27 =
  5. 5.405 + 18 =
  6. 6.152 + 27 =
  7. 7.51 + 37 =
  8. 8.44 + 47 =
  9. 9.158 + 18 =
  10. 10.446 + 27 =
  11. 11.43 + 39 =
  12. 12.392 + 59 =
  13. 13.223 + 27 =
  14. 14.459 + 29 =
  15. 15.197 + 89 =
  16. 16.137 + 57 =
  17. 17.316 + 38 =
  18. 18.201 + 89 =
  19. 19.240 + 29 =
  20. 20.469 + 18 =
  21. 21.52 + 88 =
  22. 22.315 + 39 =
  23. 23.136 + 28 =
  24. 24.480 + 18 =
  25. 25.265 + 48 =
  26. 26.233 + 68 =
  27. 27.27 + 77 =
  28. 28.331 + 57 =
  29. 29.98 + 87 =
  30. 30.315 + 78 =
  31. 31.307 + 98 =
  32. 32.113 + 57 =
  33. 33.428 + 59 =
  34. 34.146 + 27 =
  35. 35.249 + 27 =
  36. 36.441 + 17 =
  37. 37.361 + 18 =
  38. 38.272 + 89 =
  39. 39.352 + 59 =
  40. 40.42 + 18 =

Answer key

  1. 157
  2. 382
  3. 321
  4. 364
  5. 423
  6. 179
  7. 88
  8. 91
  9. 176
  10. 473
  11. 82
  12. 451
  13. 250
  14. 488
  15. 286
  16. 194
  17. 354
  18. 290
  19. 269
  20. 487
  21. 140
  22. 354
  23. 164
  24. 498
  25. 313
  26. 301
  27. 104
  28. 388
  29. 185
  30. 393
  31. 405
  32. 170
  33. 487
  34. 173
  35. 276
  36. 458
  37. 379
  38. 361
  39. 411
  40. 60

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