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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 101 · 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. 1.263 + 78 =
  2. 2.336 + 17 =
  3. 3.94 + 28 =
  4. 4.68 + 79 =
  5. 5.89 + 48 =
  6. 6.311 + 89 =
  7. 7.119 + 38 =
  8. 8.209 + 77 =
  9. 9.211 + 47 =
  10. 10.202 + 57 =
  11. 11.219 + 77 =
  12. 12.392 + 39 =
  13. 13.495 + 47 =
  14. 14.160 + 59 =
  15. 15.222 + 17 =
  16. 16.192 + 99 =
  17. 17.118 + 37 =
  18. 18.295 + 17 =
  19. 19.45 + 18 =
  20. 20.354 + 37 =
  21. 21.461 + 77 =
  22. 22.382 + 27 =
  23. 23.432 + 98 =
  24. 24.459 + 87 =
  25. 25.194 + 49 =
  26. 26.192 + 27 =
  27. 27.173 + 97 =
  28. 28.311 + 97 =
  29. 29.93 + 29 =
  30. 30.160 + 18 =
  31. 31.118 + 19 =
  32. 32.121 + 38 =
  33. 33.140 + 97 =
  34. 34.127 + 29 =
  35. 35.155 + 89 =
  36. 36.51 + 98 =
  37. 37.436 + 67 =
  38. 38.402 + 77 =
  39. 39.439 + 39 =
  40. 40.233 + 37 =

Answer key

  1. 341
  2. 353
  3. 122
  4. 147
  5. 137
  6. 400
  7. 157
  8. 286
  9. 258
  10. 259
  11. 296
  12. 431
  13. 542
  14. 219
  15. 239
  16. 291
  17. 155
  18. 312
  19. 63
  20. 391
  21. 538
  22. 409
  23. 530
  24. 546
  25. 243
  26. 219
  27. 270
  28. 408
  29. 122
  30. 178
  31. 137
  32. 159
  33. 237
  34. 156
  35. 244
  36. 149
  37. 503
  38. 479
  39. 478
  40. 270

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