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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 69 · 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. 1.466 + 47 =
  2. 2.413 + 19 =
  3. 3.58 + 57 =
  4. 4.110 + 68 =
  5. 5.254 + 17 =
  6. 6.360 + 18 =
  7. 7.79 + 37 =
  8. 8.47 + 77 =
  9. 9.129 + 19 =
  10. 10.390 + 28 =
  11. 11.403 + 87 =
  12. 12.119 + 87 =
  13. 13.158 + 67 =
  14. 14.132 + 18 =
  15. 15.388 + 47 =
  16. 16.228 + 97 =
  17. 17.152 + 87 =
  18. 18.122 + 67 =
  19. 19.366 + 37 =
  20. 20.200 + 67 =
  21. 21.204 + 98 =
  22. 22.454 + 77 =
  23. 23.391 + 49 =
  24. 24.132 + 59 =
  25. 25.474 + 97 =
  26. 26.369 + 29 =
  27. 27.51 + 28 =
  28. 28.141 + 69 =
  29. 29.341 + 69 =
  30. 30.301 + 27 =
  31. 31.241 + 78 =
  32. 32.498 + 38 =
  33. 33.52 + 87 =
  34. 34.390 + 28 =
  35. 35.234 + 38 =
  36. 36.33 + 59 =
  37. 37.59 + 68 =
  38. 38.310 + 29 =
  39. 39.357 + 37 =
  40. 40.494 + 19 =

Answer key

  1. 513
  2. 432
  3. 115
  4. 178
  5. 271
  6. 378
  7. 116
  8. 124
  9. 148
  10. 418
  11. 490
  12. 206
  13. 225
  14. 150
  15. 435
  16. 325
  17. 239
  18. 189
  19. 403
  20. 267
  21. 302
  22. 531
  23. 440
  24. 191
  25. 571
  26. 398
  27. 79
  28. 210
  29. 410
  30. 328
  31. 319
  32. 536
  33. 139
  34. 418
  35. 272
  36. 92
  37. 127
  38. 339
  39. 394
  40. 513

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