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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 808 · 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. 1.287 + 99 =
  2. 2.101 + 28 =
  3. 3.494 + 77 =
  4. 4.162 + 79 =
  5. 5.494 + 77 =
  6. 6.276 + 29 =
  7. 7.359 + 49 =
  8. 8.223 + 68 =
  9. 9.282 + 57 =
  10. 10.430 + 98 =
  11. 11.47 + 69 =
  12. 12.338 + 48 =
  13. 13.93 + 59 =
  14. 14.365 + 18 =
  15. 15.139 + 47 =
  16. 16.213 + 87 =
  17. 17.110 + 58 =
  18. 18.489 + 67 =
  19. 19.62 + 47 =
  20. 20.450 + 27 =
  21. 21.176 + 79 =
  22. 22.299 + 57 =
  23. 23.45 + 88 =
  24. 24.75 + 27 =
  25. 25.474 + 97 =
  26. 26.62 + 78 =
  27. 27.451 + 87 =
  28. 28.291 + 18 =
  29. 29.203 + 58 =
  30. 30.485 + 87 =
  31. 31.331 + 47 =
  32. 32.131 + 19 =
  33. 33.487 + 89 =
  34. 34.384 + 19 =
  35. 35.25 + 78 =
  36. 36.209 + 69 =
  37. 37.374 + 59 =
  38. 38.124 + 87 =
  39. 39.61 + 29 =
  40. 40.46 + 88 =

Answer key

  1. 386
  2. 129
  3. 571
  4. 241
  5. 571
  6. 305
  7. 408
  8. 291
  9. 339
  10. 528
  11. 116
  12. 386
  13. 152
  14. 383
  15. 186
  16. 300
  17. 168
  18. 556
  19. 109
  20. 477
  21. 255
  22. 356
  23. 133
  24. 102
  25. 571
  26. 140
  27. 538
  28. 309
  29. 261
  30. 572
  31. 378
  32. 150
  33. 576
  34. 403
  35. 103
  36. 278
  37. 433
  38. 211
  39. 90
  40. 134

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