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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 87 · 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. 1.149 + 77 =
  2. 2.77 + 67 =
  3. 3.340 + 58 =
  4. 4.63 + 57 =
  5. 5.124 + 79 =
  6. 6.38 + 49 =
  7. 7.344 + 58 =
  8. 8.326 + 88 =
  9. 9.488 + 78 =
  10. 10.372 + 58 =
  11. 11.206 + 37 =
  12. 12.55 + 17 =
  13. 13.53 + 87 =
  14. 14.208 + 79 =
  15. 15.435 + 97 =
  16. 16.280 + 89 =
  17. 17.118 + 39 =
  18. 18.303 + 97 =
  19. 19.481 + 49 =
  20. 20.136 + 39 =
  21. 21.154 + 89 =
  22. 22.245 + 19 =
  23. 23.477 + 87 =
  24. 24.119 + 69 =
  25. 25.147 + 57 =
  26. 26.293 + 48 =
  27. 27.105 + 88 =
  28. 28.133 + 48 =
  29. 29.105 + 37 =
  30. 30.188 + 69 =
  31. 31.136 + 59 =
  32. 32.292 + 68 =
  33. 33.430 + 57 =
  34. 34.484 + 27 =
  35. 35.160 + 77 =
  36. 36.384 + 79 =
  37. 37.171 + 67 =
  38. 38.399 + 48 =
  39. 39.79 + 58 =
  40. 40.325 + 48 =

Answer key

  1. 226
  2. 144
  3. 398
  4. 120
  5. 203
  6. 87
  7. 402
  8. 414
  9. 566
  10. 430
  11. 243
  12. 72
  13. 140
  14. 287
  15. 532
  16. 369
  17. 157
  18. 400
  19. 530
  20. 175
  21. 243
  22. 264
  23. 564
  24. 188
  25. 204
  26. 341
  27. 193
  28. 181
  29. 142
  30. 257
  31. 195
  32. 360
  33. 487
  34. 511
  35. 237
  36. 463
  37. 238
  38. 447
  39. 137
  40. 373

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