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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 600 · 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. 1.273 + 28 =
  2. 2.281 + 19 =
  3. 3.283 + 98 =
  4. 4.320 + 88 =
  5. 5.483 + 67 =
  6. 6.459 + 69 =
  7. 7.46 + 58 =
  8. 8.98 + 39 =
  9. 9.297 + 69 =
  10. 10.349 + 58 =
  11. 11.410 + 29 =
  12. 12.150 + 29 =
  13. 13.475 + 18 =
  14. 14.63 + 59 =
  15. 15.273 + 17 =
  16. 16.462 + 68 =
  17. 17.173 + 67 =
  18. 18.492 + 38 =
  19. 19.359 + 99 =
  20. 20.215 + 49 =
  21. 21.188 + 57 =
  22. 22.208 + 77 =
  23. 23.468 + 39 =
  24. 24.87 + 67 =
  25. 25.81 + 87 =
  26. 26.165 + 38 =
  27. 27.417 + 58 =
  28. 28.345 + 87 =
  29. 29.131 + 27 =
  30. 30.450 + 47 =
  31. 31.396 + 69 =
  32. 32.59 + 78 =
  33. 33.192 + 28 =
  34. 34.133 + 57 =
  35. 35.168 + 48 =
  36. 36.58 + 39 =
  37. 37.356 + 97 =
  38. 38.62 + 28 =
  39. 39.236 + 29 =
  40. 40.151 + 57 =

Answer key

  1. 301
  2. 300
  3. 381
  4. 408
  5. 550
  6. 528
  7. 104
  8. 137
  9. 366
  10. 407
  11. 439
  12. 179
  13. 493
  14. 122
  15. 290
  16. 530
  17. 240
  18. 530
  19. 458
  20. 264
  21. 245
  22. 285
  23. 507
  24. 154
  25. 168
  26. 203
  27. 475
  28. 432
  29. 158
  30. 497
  31. 465
  32. 137
  33. 220
  34. 190
  35. 216
  36. 97
  37. 453
  38. 90
  39. 265
  40. 208

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