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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 223 · 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. 1.428 + 17 =
  2. 2.169 + 47 =
  3. 3.100 + 98 =
  4. 4.72 + 67 =
  5. 5.28 + 97 =
  6. 6.41 + 37 =
  7. 7.309 + 78 =
  8. 8.300 + 99 =
  9. 9.198 + 29 =
  10. 10.203 + 27 =
  11. 11.440 + 39 =
  12. 12.91 + 87 =
  13. 13.84 + 19 =
  14. 14.348 + 18 =
  15. 15.494 + 78 =
  16. 16.118 + 89 =
  17. 17.67 + 17 =
  18. 18.185 + 39 =
  19. 19.277 + 77 =
  20. 20.365 + 69 =
  21. 21.459 + 38 =
  22. 22.49 + 57 =
  23. 23.211 + 37 =
  24. 24.294 + 79 =
  25. 25.387 + 48 =
  26. 26.484 + 18 =
  27. 27.164 + 38 =
  28. 28.146 + 59 =
  29. 29.170 + 47 =
  30. 30.67 + 38 =
  31. 31.112 + 27 =
  32. 32.78 + 19 =
  33. 33.294 + 17 =
  34. 34.437 + 27 =
  35. 35.126 + 49 =
  36. 36.79 + 59 =
  37. 37.108 + 39 =
  38. 38.147 + 47 =
  39. 39.230 + 37 =
  40. 40.287 + 77 =

Answer key

  1. 445
  2. 216
  3. 198
  4. 139
  5. 125
  6. 78
  7. 387
  8. 399
  9. 227
  10. 230
  11. 479
  12. 178
  13. 103
  14. 366
  15. 572
  16. 207
  17. 84
  18. 224
  19. 354
  20. 434
  21. 497
  22. 106
  23. 248
  24. 373
  25. 435
  26. 502
  27. 202
  28. 205
  29. 217
  30. 105
  31. 139
  32. 97
  33. 311
  34. 464
  35. 175
  36. 138
  37. 147
  38. 194
  39. 267
  40. 364

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