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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 115 · 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. 1.392 + 58 =
  2. 2.401 + 58 =
  3. 3.475 + 97 =
  4. 4.194 + 48 =
  5. 5.135 + 47 =
  6. 6.277 + 67 =
  7. 7.269 + 48 =
  8. 8.394 + 28 =
  9. 9.212 + 57 =
  10. 10.339 + 48 =
  11. 11.180 + 28 =
  12. 12.302 + 87 =
  13. 13.490 + 37 =
  14. 14.87 + 98 =
  15. 15.193 + 48 =
  16. 16.340 + 39 =
  17. 17.356 + 28 =
  18. 18.91 + 99 =
  19. 19.317 + 27 =
  20. 20.325 + 18 =
  21. 21.427 + 69 =
  22. 22.448 + 27 =
  23. 23.370 + 69 =
  24. 24.63 + 68 =
  25. 25.240 + 18 =
  26. 26.86 + 98 =
  27. 27.220 + 97 =
  28. 28.479 + 69 =
  29. 29.215 + 38 =
  30. 30.468 + 87 =
  31. 31.309 + 17 =
  32. 32.34 + 87 =
  33. 33.126 + 28 =
  34. 34.123 + 28 =
  35. 35.100 + 67 =
  36. 36.72 + 29 =
  37. 37.396 + 77 =
  38. 38.191 + 87 =
  39. 39.157 + 97 =
  40. 40.176 + 79 =

Answer key

  1. 450
  2. 459
  3. 572
  4. 242
  5. 182
  6. 344
  7. 317
  8. 422
  9. 269
  10. 387
  11. 208
  12. 389
  13. 527
  14. 185
  15. 241
  16. 379
  17. 384
  18. 190
  19. 344
  20. 343
  21. 496
  22. 475
  23. 439
  24. 131
  25. 258
  26. 184
  27. 317
  28. 548
  29. 253
  30. 555
  31. 326
  32. 121
  33. 154
  34. 151
  35. 167
  36. 101
  37. 473
  38. 278
  39. 254
  40. 255

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