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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 541 · 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. 1.54 + 59 =
  2. 2.162 + 47 =
  3. 3.183 + 87 =
  4. 4.200 + 39 =
  5. 5.285 + 18 =
  6. 6.164 + 77 =
  7. 7.305 + 58 =
  8. 8.67 + 19 =
  9. 9.295 + 47 =
  10. 10.373 + 39 =
  11. 11.97 + 57 =
  12. 12.211 + 88 =
  13. 13.457 + 58 =
  14. 14.216 + 89 =
  15. 15.480 + 97 =
  16. 16.404 + 47 =
  17. 17.156 + 59 =
  18. 18.135 + 67 =
  19. 19.465 + 17 =
  20. 20.332 + 38 =
  21. 21.308 + 18 =
  22. 22.450 + 69 =
  23. 23.418 + 87 =
  24. 24.406 + 57 =
  25. 25.209 + 78 =
  26. 26.489 + 97 =
  27. 27.492 + 27 =
  28. 28.109 + 88 =
  29. 29.202 + 78 =
  30. 30.163 + 98 =
  31. 31.170 + 69 =
  32. 32.46 + 28 =
  33. 33.52 + 48 =
  34. 34.257 + 18 =
  35. 35.385 + 37 =
  36. 36.241 + 68 =
  37. 37.64 + 59 =
  38. 38.66 + 29 =
  39. 39.66 + 87 =
  40. 40.220 + 19 =

Answer key

  1. 113
  2. 209
  3. 270
  4. 239
  5. 303
  6. 241
  7. 363
  8. 86
  9. 342
  10. 412
  11. 154
  12. 299
  13. 515
  14. 305
  15. 577
  16. 451
  17. 215
  18. 202
  19. 482
  20. 370
  21. 326
  22. 519
  23. 505
  24. 463
  25. 287
  26. 586
  27. 519
  28. 197
  29. 280
  30. 261
  31. 239
  32. 74
  33. 100
  34. 275
  35. 422
  36. 309
  37. 123
  38. 95
  39. 153
  40. 239

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