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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 129 · 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. 1.173 + 47 =
  2. 2.211 + 28 =
  3. 3.183 + 48 =
  4. 4.203 + 29 =
  5. 5.87 + 69 =
  6. 6.110 + 67 =
  7. 7.279 + 38 =
  8. 8.81 + 77 =
  9. 9.91 + 59 =
  10. 10.49 + 58 =
  11. 11.293 + 19 =
  12. 12.137 + 17 =
  13. 13.229 + 57 =
  14. 14.231 + 77 =
  15. 15.54 + 78 =
  16. 16.25 + 59 =
  17. 17.348 + 97 =
  18. 18.93 + 27 =
  19. 19.276 + 27 =
  20. 20.460 + 78 =
  21. 21.297 + 37 =
  22. 22.344 + 79 =
  23. 23.63 + 77 =
  24. 24.285 + 97 =
  25. 25.290 + 49 =
  26. 26.260 + 37 =
  27. 27.361 + 78 =
  28. 28.443 + 89 =
  29. 29.149 + 37 =
  30. 30.417 + 99 =
  31. 31.247 + 47 =
  32. 32.470 + 49 =
  33. 33.456 + 77 =
  34. 34.456 + 47 =
  35. 35.43 + 87 =
  36. 36.310 + 97 =
  37. 37.109 + 97 =
  38. 38.204 + 39 =
  39. 39.305 + 89 =
  40. 40.52 + 99 =

Answer key

  1. 220
  2. 239
  3. 231
  4. 232
  5. 156
  6. 177
  7. 317
  8. 158
  9. 150
  10. 107
  11. 312
  12. 154
  13. 286
  14. 308
  15. 132
  16. 84
  17. 445
  18. 120
  19. 303
  20. 538
  21. 334
  22. 423
  23. 140
  24. 382
  25. 339
  26. 297
  27. 439
  28. 532
  29. 186
  30. 516
  31. 294
  32. 519
  33. 533
  34. 503
  35. 130
  36. 407
  37. 206
  38. 243
  39. 394
  40. 151

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