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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 272 · 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. 1.331 + 17 =
  2. 2.59 + 67 =
  3. 3.229 + 89 =
  4. 4.285 + 17 =
  5. 5.144 + 48 =
  6. 6.142 + 28 =
  7. 7.337 + 79 =
  8. 8.224 + 97 =
  9. 9.331 + 29 =
  10. 10.62 + 17 =
  11. 11.350 + 97 =
  12. 12.244 + 67 =
  13. 13.306 + 19 =
  14. 14.262 + 17 =
  15. 15.451 + 18 =
  16. 16.66 + 67 =
  17. 17.436 + 48 =
  18. 18.118 + 57 =
  19. 19.80 + 98 =
  20. 20.52 + 68 =
  21. 21.70 + 87 =
  22. 22.153 + 39 =
  23. 23.203 + 87 =
  24. 24.369 + 97 =
  25. 25.42 + 89 =
  26. 26.277 + 98 =
  27. 27.157 + 59 =
  28. 28.135 + 58 =
  29. 29.355 + 39 =
  30. 30.42 + 68 =
  31. 31.271 + 17 =
  32. 32.465 + 99 =
  33. 33.140 + 98 =
  34. 34.196 + 77 =
  35. 35.320 + 69 =
  36. 36.151 + 68 =
  37. 37.84 + 87 =
  38. 38.178 + 87 =
  39. 39.66 + 47 =
  40. 40.434 + 69 =

Answer key

  1. 348
  2. 126
  3. 318
  4. 302
  5. 192
  6. 170
  7. 416
  8. 321
  9. 360
  10. 79
  11. 447
  12. 311
  13. 325
  14. 279
  15. 469
  16. 133
  17. 484
  18. 175
  19. 178
  20. 120
  21. 157
  22. 192
  23. 290
  24. 466
  25. 131
  26. 375
  27. 216
  28. 193
  29. 394
  30. 110
  31. 288
  32. 564
  33. 238
  34. 273
  35. 389
  36. 219
  37. 171
  38. 265
  39. 113
  40. 503

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