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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 340 · 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. 1.149 + 19 =
  2. 2.193 + 39 =
  3. 3.114 + 28 =
  4. 4.472 + 67 =
  5. 5.267 + 18 =
  6. 6.102 + 59 =
  7. 7.32 + 28 =
  8. 8.451 + 18 =
  9. 9.345 + 67 =
  10. 10.307 + 27 =
  11. 11.166 + 57 =
  12. 12.156 + 47 =
  13. 13.46 + 58 =
  14. 14.132 + 38 =
  15. 15.348 + 19 =
  16. 16.168 + 18 =
  17. 17.464 + 29 =
  18. 18.98 + 47 =
  19. 19.284 + 97 =
  20. 20.490 + 69 =
  21. 21.161 + 97 =
  22. 22.390 + 67 =
  23. 23.393 + 27 =
  24. 24.485 + 89 =
  25. 25.185 + 78 =
  26. 26.72 + 98 =
  27. 27.127 + 77 =
  28. 28.185 + 27 =
  29. 29.392 + 17 =
  30. 30.317 + 57 =
  31. 31.221 + 37 =
  32. 32.81 + 57 =
  33. 33.148 + 77 =
  34. 34.357 + 38 =
  35. 35.215 + 29 =
  36. 36.339 + 18 =
  37. 37.129 + 97 =
  38. 38.252 + 78 =
  39. 39.233 + 37 =
  40. 40.313 + 39 =

Answer key

  1. 168
  2. 232
  3. 142
  4. 539
  5. 285
  6. 161
  7. 60
  8. 469
  9. 412
  10. 334
  11. 223
  12. 203
  13. 104
  14. 170
  15. 367
  16. 186
  17. 493
  18. 145
  19. 381
  20. 559
  21. 258
  22. 457
  23. 420
  24. 574
  25. 263
  26. 170
  27. 204
  28. 212
  29. 409
  30. 374
  31. 258
  32. 138
  33. 225
  34. 395
  35. 244
  36. 357
  37. 226
  38. 330
  39. 270
  40. 352

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