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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 783 · 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. 1.302 + 58 =
  2. 2.95 + 49 =
  3. 3.458 + 37 =
  4. 4.362 + 19 =
  5. 5.297 + 88 =
  6. 6.160 + 39 =
  7. 7.36 + 37 =
  8. 8.450 + 18 =
  9. 9.138 + 89 =
  10. 10.362 + 89 =
  11. 11.30 + 78 =
  12. 12.293 + 47 =
  13. 13.337 + 78 =
  14. 14.249 + 19 =
  15. 15.405 + 37 =
  16. 16.94 + 37 =
  17. 17.306 + 18 =
  18. 18.397 + 69 =
  19. 19.390 + 68 =
  20. 20.59 + 67 =
  21. 21.98 + 97 =
  22. 22.270 + 48 =
  23. 23.398 + 69 =
  24. 24.378 + 59 =
  25. 25.64 + 87 =
  26. 26.315 + 79 =
  27. 27.158 + 19 =
  28. 28.124 + 87 =
  29. 29.425 + 27 =
  30. 30.166 + 68 =
  31. 31.491 + 17 =
  32. 32.447 + 49 =
  33. 33.480 + 67 =
  34. 34.67 + 88 =
  35. 35.212 + 27 =
  36. 36.113 + 79 =
  37. 37.190 + 18 =
  38. 38.437 + 38 =
  39. 39.448 + 68 =
  40. 40.441 + 19 =

Answer key

  1. 360
  2. 144
  3. 495
  4. 381
  5. 385
  6. 199
  7. 73
  8. 468
  9. 227
  10. 451
  11. 108
  12. 340
  13. 415
  14. 268
  15. 442
  16. 131
  17. 324
  18. 466
  19. 458
  20. 126
  21. 195
  22. 318
  23. 467
  24. 437
  25. 151
  26. 394
  27. 177
  28. 211
  29. 452
  30. 234
  31. 508
  32. 496
  33. 547
  34. 155
  35. 239
  36. 192
  37. 208
  38. 475
  39. 516
  40. 460

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