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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 528 · 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. 1.94 + 28 =
  2. 2.53 + 97 =
  3. 3.356 + 17 =
  4. 4.154 + 38 =
  5. 5.140 + 79 =
  6. 6.74 + 69 =
  7. 7.102 + 78 =
  8. 8.117 + 59 =
  9. 9.131 + 39 =
  10. 10.54 + 69 =
  11. 11.164 + 38 =
  12. 12.255 + 79 =
  13. 13.399 + 48 =
  14. 14.233 + 47 =
  15. 15.281 + 38 =
  16. 16.58 + 89 =
  17. 17.350 + 18 =
  18. 18.198 + 18 =
  19. 19.69 + 69 =
  20. 20.218 + 57 =
  21. 21.425 + 39 =
  22. 22.307 + 97 =
  23. 23.394 + 98 =
  24. 24.125 + 99 =
  25. 25.416 + 17 =
  26. 26.381 + 29 =
  27. 27.141 + 88 =
  28. 28.416 + 57 =
  29. 29.233 + 67 =
  30. 30.482 + 77 =
  31. 31.370 + 27 =
  32. 32.78 + 18 =
  33. 33.61 + 69 =
  34. 34.250 + 88 =
  35. 35.231 + 97 =
  36. 36.41 + 79 =
  37. 37.378 + 39 =
  38. 38.348 + 58 =
  39. 39.109 + 19 =
  40. 40.155 + 18 =

Answer key

  1. 122
  2. 150
  3. 373
  4. 192
  5. 219
  6. 143
  7. 180
  8. 176
  9. 170
  10. 123
  11. 202
  12. 334
  13. 447
  14. 280
  15. 319
  16. 147
  17. 368
  18. 216
  19. 138
  20. 275
  21. 464
  22. 404
  23. 492
  24. 224
  25. 433
  26. 410
  27. 229
  28. 473
  29. 300
  30. 559
  31. 397
  32. 96
  33. 130
  34. 338
  35. 328
  36. 120
  37. 417
  38. 406
  39. 128
  40. 173

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