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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 98 · 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. 1.274 + 38 =
  2. 2.271 + 17 =
  3. 3.277 + 38 =
  4. 4.196 + 78 =
  5. 5.140 + 39 =
  6. 6.39 + 68 =
  7. 7.328 + 37 =
  8. 8.159 + 27 =
  9. 9.116 + 67 =
  10. 10.201 + 59 =
  11. 11.144 + 88 =
  12. 12.153 + 77 =
  13. 13.312 + 87 =
  14. 14.250 + 77 =
  15. 15.264 + 17 =
  16. 16.47 + 27 =
  17. 17.399 + 29 =
  18. 18.62 + 97 =
  19. 19.326 + 48 =
  20. 20.391 + 99 =
  21. 21.133 + 49 =
  22. 22.31 + 59 =
  23. 23.48 + 48 =
  24. 24.349 + 77 =
  25. 25.118 + 47 =
  26. 26.385 + 18 =
  27. 27.45 + 68 =
  28. 28.71 + 99 =
  29. 29.440 + 58 =
  30. 30.471 + 98 =
  31. 31.453 + 77 =
  32. 32.293 + 77 =
  33. 33.115 + 19 =
  34. 34.345 + 69 =
  35. 35.345 + 48 =
  36. 36.83 + 28 =
  37. 37.47 + 88 =
  38. 38.105 + 99 =
  39. 39.46 + 99 =
  40. 40.470 + 77 =

Answer key

  1. 312
  2. 288
  3. 315
  4. 274
  5. 179
  6. 107
  7. 365
  8. 186
  9. 183
  10. 260
  11. 232
  12. 230
  13. 399
  14. 327
  15. 281
  16. 74
  17. 428
  18. 159
  19. 374
  20. 490
  21. 182
  22. 90
  23. 96
  24. 426
  25. 165
  26. 403
  27. 113
  28. 170
  29. 498
  30. 569
  31. 530
  32. 370
  33. 134
  34. 414
  35. 393
  36. 111
  37. 135
  38. 204
  39. 145
  40. 547

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