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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 675 · 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. 1.96 + 88 =
  2. 2.407 + 27 =
  3. 3.120 + 57 =
  4. 4.192 + 67 =
  5. 5.188 + 48 =
  6. 6.88 + 37 =
  7. 7.367 + 18 =
  8. 8.38 + 17 =
  9. 9.277 + 49 =
  10. 10.140 + 28 =
  11. 11.352 + 27 =
  12. 12.192 + 87 =
  13. 13.409 + 39 =
  14. 14.481 + 98 =
  15. 15.237 + 37 =
  16. 16.39 + 58 =
  17. 17.486 + 48 =
  18. 18.325 + 79 =
  19. 19.415 + 18 =
  20. 20.267 + 17 =
  21. 21.141 + 59 =
  22. 22.110 + 48 =
  23. 23.193 + 18 =
  24. 24.168 + 27 =
  25. 25.265 + 57 =
  26. 26.456 + 78 =
  27. 27.396 + 77 =
  28. 28.88 + 59 =
  29. 29.197 + 58 =
  30. 30.73 + 77 =
  31. 31.99 + 67 =
  32. 32.422 + 39 =
  33. 33.143 + 79 =
  34. 34.277 + 18 =
  35. 35.116 + 27 =
  36. 36.97 + 78 =
  37. 37.173 + 77 =
  38. 38.156 + 19 =
  39. 39.150 + 67 =
  40. 40.64 + 88 =

Answer key

  1. 184
  2. 434
  3. 177
  4. 259
  5. 236
  6. 125
  7. 385
  8. 55
  9. 326
  10. 168
  11. 379
  12. 279
  13. 448
  14. 579
  15. 274
  16. 97
  17. 534
  18. 404
  19. 433
  20. 284
  21. 200
  22. 158
  23. 211
  24. 195
  25. 322
  26. 534
  27. 473
  28. 147
  29. 255
  30. 150
  31. 166
  32. 461
  33. 222
  34. 295
  35. 143
  36. 175
  37. 250
  38. 175
  39. 217
  40. 152

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