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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 204 · 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. 1.49 + 87 =
  2. 2.35 + 38 =
  3. 3.191 + 17 =
  4. 4.457 + 17 =
  5. 5.447 + 89 =
  6. 6.154 + 29 =
  7. 7.275 + 27 =
  8. 8.114 + 67 =
  9. 9.206 + 58 =
  10. 10.366 + 47 =
  11. 11.370 + 69 =
  12. 12.439 + 79 =
  13. 13.410 + 89 =
  14. 14.263 + 27 =
  15. 15.471 + 28 =
  16. 16.200 + 57 =
  17. 17.344 + 28 =
  18. 18.246 + 18 =
  19. 19.287 + 47 =
  20. 20.242 + 78 =
  21. 21.72 + 39 =
  22. 22.267 + 78 =
  23. 23.300 + 38 =
  24. 24.64 + 38 =
  25. 25.88 + 28 =
  26. 26.148 + 39 =
  27. 27.51 + 88 =
  28. 28.449 + 67 =
  29. 29.211 + 19 =
  30. 30.231 + 99 =
  31. 31.210 + 38 =
  32. 32.475 + 47 =
  33. 33.361 + 97 =
  34. 34.258 + 59 =
  35. 35.134 + 87 =
  36. 36.455 + 87 =
  37. 37.374 + 48 =
  38. 38.88 + 57 =
  39. 39.177 + 68 =
  40. 40.146 + 17 =

Answer key

  1. 136
  2. 73
  3. 208
  4. 474
  5. 536
  6. 183
  7. 302
  8. 181
  9. 264
  10. 413
  11. 439
  12. 518
  13. 499
  14. 290
  15. 499
  16. 257
  17. 372
  18. 264
  19. 334
  20. 320
  21. 111
  22. 345
  23. 338
  24. 102
  25. 116
  26. 187
  27. 139
  28. 516
  29. 230
  30. 330
  31. 248
  32. 522
  33. 458
  34. 317
  35. 221
  36. 542
  37. 422
  38. 145
  39. 245
  40. 163

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