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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 238 · 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. 1.125 + 77 =
  2. 2.486 + 19 =
  3. 3.231 + 88 =
  4. 4.427 + 69 =
  5. 5.166 + 57 =
  6. 6.200 + 88 =
  7. 7.44 + 68 =
  8. 8.472 + 98 =
  9. 9.264 + 47 =
  10. 10.192 + 27 =
  11. 11.31 + 69 =
  12. 12.306 + 67 =
  13. 13.278 + 49 =
  14. 14.202 + 27 =
  15. 15.422 + 89 =
  16. 16.118 + 67 =
  17. 17.450 + 78 =
  18. 18.376 + 29 =
  19. 19.140 + 79 =
  20. 20.357 + 79 =
  21. 21.213 + 98 =
  22. 22.385 + 67 =
  23. 23.114 + 39 =
  24. 24.313 + 87 =
  25. 25.343 + 79 =
  26. 26.277 + 29 =
  27. 27.342 + 57 =
  28. 28.380 + 38 =
  29. 29.248 + 48 =
  30. 30.63 + 99 =
  31. 31.460 + 57 =
  32. 32.160 + 19 =
  33. 33.472 + 37 =
  34. 34.419 + 97 =
  35. 35.42 + 28 =
  36. 36.486 + 57 =
  37. 37.496 + 27 =
  38. 38.145 + 77 =
  39. 39.156 + 89 =
  40. 40.336 + 99 =

Answer key

  1. 202
  2. 505
  3. 319
  4. 496
  5. 223
  6. 288
  7. 112
  8. 570
  9. 311
  10. 219
  11. 100
  12. 373
  13. 327
  14. 229
  15. 511
  16. 185
  17. 528
  18. 405
  19. 219
  20. 436
  21. 311
  22. 452
  23. 153
  24. 400
  25. 422
  26. 306
  27. 399
  28. 418
  29. 296
  30. 162
  31. 517
  32. 179
  33. 509
  34. 516
  35. 70
  36. 543
  37. 523
  38. 222
  39. 245
  40. 435

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