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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 83 · 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. 1.485 + 67 =
  2. 2.225 + 89 =
  3. 3.247 + 19 =
  4. 4.358 + 19 =
  5. 5.80 + 29 =
  6. 6.308 + 38 =
  7. 7.270 + 57 =
  8. 8.496 + 28 =
  9. 9.118 + 79 =
  10. 10.444 + 77 =
  11. 11.414 + 29 =
  12. 12.32 + 67 =
  13. 13.299 + 69 =
  14. 14.268 + 57 =
  15. 15.200 + 48 =
  16. 16.78 + 69 =
  17. 17.125 + 69 =
  18. 18.114 + 47 =
  19. 19.489 + 38 =
  20. 20.411 + 49 =
  21. 21.103 + 19 =
  22. 22.111 + 67 =
  23. 23.117 + 79 =
  24. 24.104 + 97 =
  25. 25.360 + 37 =
  26. 26.499 + 79 =
  27. 27.59 + 89 =
  28. 28.97 + 37 =
  29. 29.153 + 97 =
  30. 30.475 + 29 =
  31. 31.63 + 48 =
  32. 32.483 + 97 =
  33. 33.431 + 68 =
  34. 34.89 + 67 =
  35. 35.348 + 29 =
  36. 36.415 + 87 =
  37. 37.250 + 68 =
  38. 38.242 + 27 =
  39. 39.279 + 37 =
  40. 40.89 + 18 =

Answer key

  1. 552
  2. 314
  3. 266
  4. 377
  5. 109
  6. 346
  7. 327
  8. 524
  9. 197
  10. 521
  11. 443
  12. 99
  13. 368
  14. 325
  15. 248
  16. 147
  17. 194
  18. 161
  19. 527
  20. 460
  21. 122
  22. 178
  23. 196
  24. 201
  25. 397
  26. 578
  27. 148
  28. 134
  29. 250
  30. 504
  31. 111
  32. 580
  33. 499
  34. 156
  35. 377
  36. 502
  37. 318
  38. 269
  39. 316
  40. 107

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