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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 20 · 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. 1.351 + 37 =
  2. 2.68 + 59 =
  3. 3.98 + 58 =
  4. 4.454 + 89 =
  5. 5.66 + 29 =
  6. 6.30 + 68 =
  7. 7.221 + 88 =
  8. 8.403 + 89 =
  9. 9.423 + 27 =
  10. 10.108 + 98 =
  11. 11.390 + 67 =
  12. 12.359 + 69 =
  13. 13.484 + 18 =
  14. 14.365 + 68 =
  15. 15.229 + 79 =
  16. 16.38 + 38 =
  17. 17.261 + 69 =
  18. 18.158 + 39 =
  19. 19.377 + 79 =
  20. 20.44 + 49 =
  21. 21.363 + 88 =
  22. 22.169 + 38 =
  23. 23.245 + 39 =
  24. 24.479 + 78 =
  25. 25.74 + 87 =
  26. 26.259 + 27 =
  27. 27.318 + 27 =
  28. 28.220 + 49 =
  29. 29.336 + 17 =
  30. 30.123 + 69 =
  31. 31.46 + 57 =
  32. 32.462 + 88 =
  33. 33.199 + 98 =
  34. 34.174 + 39 =
  35. 35.171 + 77 =
  36. 36.25 + 58 =
  37. 37.154 + 28 =
  38. 38.49 + 77 =
  39. 39.89 + 89 =
  40. 40.125 + 17 =

Answer key

  1. 388
  2. 127
  3. 156
  4. 543
  5. 95
  6. 98
  7. 309
  8. 492
  9. 450
  10. 206
  11. 457
  12. 428
  13. 502
  14. 433
  15. 308
  16. 76
  17. 330
  18. 197
  19. 456
  20. 93
  21. 451
  22. 207
  23. 284
  24. 557
  25. 161
  26. 286
  27. 345
  28. 269
  29. 353
  30. 192
  31. 103
  32. 550
  33. 297
  34. 213
  35. 248
  36. 83
  37. 182
  38. 126
  39. 178
  40. 142

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