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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 269 · 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. 1.342 + 57 =
  2. 2.100 + 88 =
  3. 3.95 + 18 =
  4. 4.171 + 87 =
  5. 5.480 + 47 =
  6. 6.120 + 49 =
  7. 7.225 + 37 =
  8. 8.455 + 78 =
  9. 9.92 + 17 =
  10. 10.496 + 78 =
  11. 11.342 + 29 =
  12. 12.270 + 77 =
  13. 13.458 + 87 =
  14. 14.247 + 87 =
  15. 15.347 + 77 =
  16. 16.400 + 27 =
  17. 17.213 + 97 =
  18. 18.497 + 89 =
  19. 19.474 + 57 =
  20. 20.102 + 98 =
  21. 21.464 + 78 =
  22. 22.390 + 57 =
  23. 23.219 + 69 =
  24. 24.469 + 17 =
  25. 25.305 + 79 =
  26. 26.370 + 19 =
  27. 27.484 + 68 =
  28. 28.238 + 39 =
  29. 29.149 + 39 =
  30. 30.378 + 79 =
  31. 31.377 + 87 =
  32. 32.32 + 48 =
  33. 33.427 + 99 =
  34. 34.258 + 28 =
  35. 35.140 + 27 =
  36. 36.491 + 79 =
  37. 37.83 + 97 =
  38. 38.105 + 29 =
  39. 39.398 + 89 =
  40. 40.318 + 79 =

Answer key

  1. 399
  2. 188
  3. 113
  4. 258
  5. 527
  6. 169
  7. 262
  8. 533
  9. 109
  10. 574
  11. 371
  12. 347
  13. 545
  14. 334
  15. 424
  16. 427
  17. 310
  18. 586
  19. 531
  20. 200
  21. 542
  22. 447
  23. 288
  24. 486
  25. 384
  26. 389
  27. 552
  28. 277
  29. 188
  30. 457
  31. 464
  32. 80
  33. 526
  34. 286
  35. 167
  36. 570
  37. 180
  38. 134
  39. 487
  40. 397

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