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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 180 · 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. 1.440 + 89 =
  2. 2.207 + 19 =
  3. 3.130 + 98 =
  4. 4.273 + 47 =
  5. 5.256 + 29 =
  6. 6.480 + 29 =
  7. 7.454 + 77 =
  8. 8.102 + 27 =
  9. 9.128 + 58 =
  10. 10.147 + 78 =
  11. 11.186 + 39 =
  12. 12.451 + 28 =
  13. 13.84 + 79 =
  14. 14.55 + 68 =
  15. 15.234 + 87 =
  16. 16.155 + 17 =
  17. 17.480 + 87 =
  18. 18.249 + 78 =
  19. 19.360 + 99 =
  20. 20.328 + 59 =
  21. 21.330 + 79 =
  22. 22.193 + 29 =
  23. 23.114 + 39 =
  24. 24.436 + 78 =
  25. 25.497 + 48 =
  26. 26.221 + 69 =
  27. 27.44 + 87 =
  28. 28.117 + 68 =
  29. 29.27 + 88 =
  30. 30.421 + 57 =
  31. 31.436 + 98 =
  32. 32.443 + 37 =
  33. 33.286 + 68 =
  34. 34.340 + 28 =
  35. 35.411 + 28 =
  36. 36.260 + 47 =
  37. 37.115 + 79 =
  38. 38.78 + 68 =
  39. 39.213 + 57 =
  40. 40.80 + 79 =

Answer key

  1. 529
  2. 226
  3. 228
  4. 320
  5. 285
  6. 509
  7. 531
  8. 129
  9. 186
  10. 225
  11. 225
  12. 479
  13. 163
  14. 123
  15. 321
  16. 172
  17. 567
  18. 327
  19. 459
  20. 387
  21. 409
  22. 222
  23. 153
  24. 514
  25. 545
  26. 290
  27. 131
  28. 185
  29. 115
  30. 478
  31. 534
  32. 480
  33. 354
  34. 368
  35. 439
  36. 307
  37. 194
  38. 146
  39. 270
  40. 159

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