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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 417 · 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. 1.69 + 47 =
  2. 2.285 + 69 =
  3. 3.410 + 67 =
  4. 4.367 + 17 =
  5. 5.88 + 29 =
  6. 6.316 + 18 =
  7. 7.413 + 37 =
  8. 8.221 + 39 =
  9. 9.358 + 19 =
  10. 10.75 + 27 =
  11. 11.265 + 19 =
  12. 12.141 + 47 =
  13. 13.112 + 88 =
  14. 14.327 + 29 =
  15. 15.469 + 99 =
  16. 16.386 + 39 =
  17. 17.480 + 69 =
  18. 18.337 + 77 =
  19. 19.176 + 17 =
  20. 20.62 + 38 =
  21. 21.346 + 89 =
  22. 22.215 + 78 =
  23. 23.127 + 49 =
  24. 24.64 + 37 =
  25. 25.59 + 17 =
  26. 26.228 + 28 =
  27. 27.228 + 48 =
  28. 28.25 + 89 =
  29. 29.326 + 67 =
  30. 30.125 + 17 =
  31. 31.30 + 29 =
  32. 32.324 + 29 =
  33. 33.488 + 78 =
  34. 34.332 + 99 =
  35. 35.240 + 27 =
  36. 36.150 + 17 =
  37. 37.40 + 58 =
  38. 38.61 + 37 =
  39. 39.396 + 18 =
  40. 40.240 + 67 =

Answer key

  1. 116
  2. 354
  3. 477
  4. 384
  5. 117
  6. 334
  7. 450
  8. 260
  9. 377
  10. 102
  11. 284
  12. 188
  13. 200
  14. 356
  15. 568
  16. 425
  17. 549
  18. 414
  19. 193
  20. 100
  21. 435
  22. 293
  23. 176
  24. 101
  25. 76
  26. 256
  27. 276
  28. 114
  29. 393
  30. 142
  31. 59
  32. 353
  33. 566
  34. 431
  35. 267
  36. 167
  37. 98
  38. 98
  39. 414
  40. 307

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