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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 495 · 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. 1.494 + 38 =
  2. 2.64 + 68 =
  3. 3.127 + 59 =
  4. 4.317 + 97 =
  5. 5.189 + 67 =
  6. 6.42 + 29 =
  7. 7.112 + 99 =
  8. 8.282 + 28 =
  9. 9.349 + 98 =
  10. 10.149 + 57 =
  11. 11.339 + 19 =
  12. 12.61 + 89 =
  13. 13.370 + 97 =
  14. 14.112 + 39 =
  15. 15.81 + 27 =
  16. 16.87 + 69 =
  17. 17.344 + 59 =
  18. 18.418 + 28 =
  19. 19.165 + 68 =
  20. 20.181 + 38 =
  21. 21.350 + 19 =
  22. 22.72 + 19 =
  23. 23.82 + 17 =
  24. 24.473 + 48 =
  25. 25.246 + 19 =
  26. 26.389 + 67 =
  27. 27.401 + 28 =
  28. 28.229 + 38 =
  29. 29.199 + 39 =
  30. 30.473 + 97 =
  31. 31.60 + 38 =
  32. 32.365 + 57 =
  33. 33.73 + 57 =
  34. 34.37 + 27 =
  35. 35.181 + 97 =
  36. 36.332 + 57 =
  37. 37.356 + 19 =
  38. 38.413 + 18 =
  39. 39.458 + 69 =
  40. 40.426 + 47 =

Answer key

  1. 532
  2. 132
  3. 186
  4. 414
  5. 256
  6. 71
  7. 211
  8. 310
  9. 447
  10. 206
  11. 358
  12. 150
  13. 467
  14. 151
  15. 108
  16. 156
  17. 403
  18. 446
  19. 233
  20. 219
  21. 369
  22. 91
  23. 99
  24. 521
  25. 265
  26. 456
  27. 429
  28. 267
  29. 238
  30. 570
  31. 98
  32. 422
  33. 130
  34. 64
  35. 278
  36. 389
  37. 375
  38. 431
  39. 527
  40. 473

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