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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 769 · 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. 1.225 + 77 =
  2. 2.213 + 79 =
  3. 3.195 + 28 =
  4. 4.152 + 39 =
  5. 5.327 + 77 =
  6. 6.305 + 27 =
  7. 7.80 + 87 =
  8. 8.270 + 88 =
  9. 9.105 + 39 =
  10. 10.79 + 58 =
  11. 11.272 + 28 =
  12. 12.231 + 58 =
  13. 13.464 + 97 =
  14. 14.153 + 97 =
  15. 15.282 + 89 =
  16. 16.57 + 48 =
  17. 17.192 + 78 =
  18. 18.367 + 78 =
  19. 19.328 + 49 =
  20. 20.361 + 39 =
  21. 21.449 + 58 =
  22. 22.468 + 88 =
  23. 23.197 + 28 =
  24. 24.114 + 38 =
  25. 25.384 + 78 =
  26. 26.35 + 27 =
  27. 27.153 + 77 =
  28. 28.388 + 28 =
  29. 29.337 + 58 =
  30. 30.142 + 79 =
  31. 31.66 + 57 =
  32. 32.372 + 89 =
  33. 33.90 + 88 =
  34. 34.109 + 48 =
  35. 35.259 + 47 =
  36. 36.126 + 77 =
  37. 37.179 + 98 =
  38. 38.387 + 29 =
  39. 39.335 + 89 =
  40. 40.200 + 37 =

Answer key

  1. 302
  2. 292
  3. 223
  4. 191
  5. 404
  6. 332
  7. 167
  8. 358
  9. 144
  10. 137
  11. 300
  12. 289
  13. 561
  14. 250
  15. 371
  16. 105
  17. 270
  18. 445
  19. 377
  20. 400
  21. 507
  22. 556
  23. 225
  24. 152
  25. 462
  26. 62
  27. 230
  28. 416
  29. 395
  30. 221
  31. 123
  32. 461
  33. 178
  34. 157
  35. 306
  36. 203
  37. 277
  38. 416
  39. 424
  40. 237

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