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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 191 · 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. 1.58 + 59 =
  2. 2.39 + 28 =
  3. 3.104 + 48 =
  4. 4.407 + 49 =
  5. 5.176 + 27 =
  6. 6.149 + 67 =
  7. 7.185 + 48 =
  8. 8.431 + 48 =
  9. 9.453 + 87 =
  10. 10.204 + 27 =
  11. 11.299 + 47 =
  12. 12.250 + 18 =
  13. 13.344 + 38 =
  14. 14.296 + 48 =
  15. 15.117 + 17 =
  16. 16.381 + 69 =
  17. 17.354 + 47 =
  18. 18.150 + 89 =
  19. 19.129 + 27 =
  20. 20.66 + 98 =
  21. 21.476 + 98 =
  22. 22.55 + 38 =
  23. 23.141 + 78 =
  24. 24.327 + 27 =
  25. 25.469 + 47 =
  26. 26.140 + 27 =
  27. 27.183 + 88 =
  28. 28.143 + 18 =
  29. 29.340 + 59 =
  30. 30.479 + 69 =
  31. 31.175 + 77 =
  32. 32.342 + 69 =
  33. 33.423 + 87 =
  34. 34.174 + 48 =
  35. 35.426 + 17 =
  36. 36.191 + 49 =
  37. 37.76 + 59 =
  38. 38.191 + 38 =
  39. 39.399 + 69 =
  40. 40.310 + 78 =

Answer key

  1. 117
  2. 67
  3. 152
  4. 456
  5. 203
  6. 216
  7. 233
  8. 479
  9. 540
  10. 231
  11. 346
  12. 268
  13. 382
  14. 344
  15. 134
  16. 450
  17. 401
  18. 239
  19. 156
  20. 164
  21. 574
  22. 93
  23. 219
  24. 354
  25. 516
  26. 167
  27. 271
  28. 161
  29. 399
  30. 548
  31. 252
  32. 411
  33. 510
  34. 222
  35. 443
  36. 240
  37. 135
  38. 229
  39. 468
  40. 388

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