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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 138 · 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. 1.327 + 77 =
  2. 2.89 + 27 =
  3. 3.68 + 19 =
  4. 4.263 + 69 =
  5. 5.413 + 89 =
  6. 6.193 + 47 =
  7. 7.180 + 79 =
  8. 8.75 + 99 =
  9. 9.280 + 68 =
  10. 10.170 + 88 =
  11. 11.201 + 87 =
  12. 12.75 + 67 =
  13. 13.377 + 17 =
  14. 14.406 + 18 =
  15. 15.430 + 38 =
  16. 16.391 + 77 =
  17. 17.113 + 29 =
  18. 18.447 + 27 =
  19. 19.136 + 18 =
  20. 20.85 + 47 =
  21. 21.80 + 27 =
  22. 22.448 + 87 =
  23. 23.70 + 38 =
  24. 24.143 + 77 =
  25. 25.229 + 38 =
  26. 26.119 + 37 =
  27. 27.64 + 57 =
  28. 28.191 + 78 =
  29. 29.428 + 37 =
  30. 30.71 + 18 =
  31. 31.74 + 17 =
  32. 32.49 + 97 =
  33. 33.433 + 39 =
  34. 34.359 + 77 =
  35. 35.309 + 79 =
  36. 36.380 + 18 =
  37. 37.114 + 87 =
  38. 38.246 + 27 =
  39. 39.113 + 59 =
  40. 40.113 + 78 =

Answer key

  1. 404
  2. 116
  3. 87
  4. 332
  5. 502
  6. 240
  7. 259
  8. 174
  9. 348
  10. 258
  11. 288
  12. 142
  13. 394
  14. 424
  15. 468
  16. 468
  17. 142
  18. 474
  19. 154
  20. 132
  21. 107
  22. 535
  23. 108
  24. 220
  25. 267
  26. 156
  27. 121
  28. 269
  29. 465
  30. 89
  31. 91
  32. 146
  33. 472
  34. 436
  35. 388
  36. 398
  37. 201
  38. 273
  39. 172
  40. 191

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