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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 332 · 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. 1.150 + 69 =
  2. 2.489 + 57 =
  3. 3.274 + 69 =
  4. 4.363 + 48 =
  5. 5.146 + 78 =
  6. 6.163 + 47 =
  7. 7.445 + 18 =
  8. 8.393 + 17 =
  9. 9.417 + 49 =
  10. 10.199 + 89 =
  11. 11.40 + 39 =
  12. 12.441 + 87 =
  13. 13.110 + 48 =
  14. 14.114 + 69 =
  15. 15.252 + 27 =
  16. 16.209 + 79 =
  17. 17.371 + 18 =
  18. 18.372 + 39 =
  19. 19.404 + 89 =
  20. 20.207 + 49 =
  21. 21.258 + 39 =
  22. 22.496 + 19 =
  23. 23.273 + 67 =
  24. 24.46 + 27 =
  25. 25.398 + 68 =
  26. 26.28 + 37 =
  27. 27.230 + 68 =
  28. 28.157 + 18 =
  29. 29.312 + 98 =
  30. 30.323 + 29 =
  31. 31.448 + 89 =
  32. 32.46 + 27 =
  33. 33.76 + 88 =
  34. 34.135 + 99 =
  35. 35.311 + 48 =
  36. 36.433 + 67 =
  37. 37.267 + 88 =
  38. 38.278 + 48 =
  39. 39.450 + 18 =
  40. 40.305 + 87 =

Answer key

  1. 219
  2. 546
  3. 343
  4. 411
  5. 224
  6. 210
  7. 463
  8. 410
  9. 466
  10. 288
  11. 79
  12. 528
  13. 158
  14. 183
  15. 279
  16. 288
  17. 389
  18. 411
  19. 493
  20. 256
  21. 297
  22. 515
  23. 340
  24. 73
  25. 466
  26. 65
  27. 298
  28. 175
  29. 410
  30. 352
  31. 537
  32. 73
  33. 164
  34. 234
  35. 359
  36. 500
  37. 355
  38. 326
  39. 468
  40. 392

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