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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 722 · 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. 1.349 + 99 =
  2. 2.158 + 17 =
  3. 3.358 + 69 =
  4. 4.129 + 48 =
  5. 5.430 + 97 =
  6. 6.54 + 39 =
  7. 7.248 + 27 =
  8. 8.28 + 28 =
  9. 9.194 + 58 =
  10. 10.242 + 37 =
  11. 11.289 + 39 =
  12. 12.156 + 77 =
  13. 13.440 + 78 =
  14. 14.357 + 18 =
  15. 15.107 + 57 =
  16. 16.337 + 68 =
  17. 17.283 + 57 =
  18. 18.151 + 49 =
  19. 19.70 + 19 =
  20. 20.130 + 98 =
  21. 21.196 + 79 =
  22. 22.229 + 48 =
  23. 23.116 + 47 =
  24. 24.402 + 77 =
  25. 25.63 + 49 =
  26. 26.185 + 87 =
  27. 27.337 + 19 =
  28. 28.369 + 89 =
  29. 29.301 + 28 =
  30. 30.403 + 47 =
  31. 31.197 + 88 =
  32. 32.30 + 89 =
  33. 33.93 + 97 =
  34. 34.387 + 18 =
  35. 35.130 + 19 =
  36. 36.332 + 68 =
  37. 37.219 + 89 =
  38. 38.390 + 28 =
  39. 39.314 + 68 =
  40. 40.182 + 38 =

Answer key

  1. 448
  2. 175
  3. 427
  4. 177
  5. 527
  6. 93
  7. 275
  8. 56
  9. 252
  10. 279
  11. 328
  12. 233
  13. 518
  14. 375
  15. 164
  16. 405
  17. 340
  18. 200
  19. 89
  20. 228
  21. 275
  22. 277
  23. 163
  24. 479
  25. 112
  26. 272
  27. 356
  28. 458
  29. 329
  30. 450
  31. 285
  32. 119
  33. 190
  34. 405
  35. 149
  36. 400
  37. 308
  38. 418
  39. 382
  40. 220

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