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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 501 · 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. 1.308 + 88 =
  2. 2.384 + 17 =
  3. 3.384 + 59 =
  4. 4.66 + 79 =
  5. 5.304 + 29 =
  6. 6.65 + 18 =
  7. 7.85 + 97 =
  8. 8.330 + 69 =
  9. 9.113 + 18 =
  10. 10.92 + 98 =
  11. 11.498 + 37 =
  12. 12.494 + 99 =
  13. 13.140 + 18 =
  14. 14.339 + 39 =
  15. 15.54 + 58 =
  16. 16.431 + 97 =
  17. 17.178 + 87 =
  18. 18.184 + 57 =
  19. 19.42 + 28 =
  20. 20.265 + 68 =
  21. 21.437 + 57 =
  22. 22.77 + 69 =
  23. 23.273 + 68 =
  24. 24.299 + 27 =
  25. 25.261 + 29 =
  26. 26.162 + 67 =
  27. 27.155 + 49 =
  28. 28.266 + 67 =
  29. 29.99 + 28 =
  30. 30.275 + 59 =
  31. 31.101 + 58 =
  32. 32.50 + 38 =
  33. 33.152 + 69 =
  34. 34.376 + 78 =
  35. 35.480 + 57 =
  36. 36.496 + 97 =
  37. 37.28 + 68 =
  38. 38.330 + 87 =
  39. 39.344 + 17 =
  40. 40.270 + 58 =

Answer key

  1. 396
  2. 401
  3. 443
  4. 145
  5. 333
  6. 83
  7. 182
  8. 399
  9. 131
  10. 190
  11. 535
  12. 593
  13. 158
  14. 378
  15. 112
  16. 528
  17. 265
  18. 241
  19. 70
  20. 333
  21. 494
  22. 146
  23. 341
  24. 326
  25. 290
  26. 229
  27. 204
  28. 333
  29. 127
  30. 334
  31. 159
  32. 88
  33. 221
  34. 454
  35. 537
  36. 593
  37. 96
  38. 417
  39. 361
  40. 328

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