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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 304 · 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. 1.436 + 67 =
  2. 2.438 + 18 =
  3. 3.308 + 77 =
  4. 4.304 + 27 =
  5. 5.119 + 89 =
  6. 6.82 + 98 =
  7. 7.289 + 48 =
  8. 8.287 + 97 =
  9. 9.173 + 98 =
  10. 10.114 + 69 =
  11. 11.127 + 79 =
  12. 12.95 + 99 =
  13. 13.269 + 38 =
  14. 14.163 + 87 =
  15. 15.311 + 47 =
  16. 16.371 + 57 =
  17. 17.176 + 97 =
  18. 18.457 + 28 =
  19. 19.83 + 19 =
  20. 20.73 + 88 =
  21. 21.236 + 68 =
  22. 22.189 + 78 =
  23. 23.404 + 79 =
  24. 24.286 + 17 =
  25. 25.260 + 28 =
  26. 26.151 + 89 =
  27. 27.55 + 87 =
  28. 28.141 + 88 =
  29. 29.167 + 17 =
  30. 30.227 + 39 =
  31. 31.67 + 28 =
  32. 32.181 + 27 =
  33. 33.418 + 18 =
  34. 34.339 + 57 =
  35. 35.361 + 97 =
  36. 36.152 + 47 =
  37. 37.387 + 77 =
  38. 38.166 + 88 =
  39. 39.263 + 58 =
  40. 40.65 + 77 =

Answer key

  1. 503
  2. 456
  3. 385
  4. 331
  5. 208
  6. 180
  7. 337
  8. 384
  9. 271
  10. 183
  11. 206
  12. 194
  13. 307
  14. 250
  15. 358
  16. 428
  17. 273
  18. 485
  19. 102
  20. 161
  21. 304
  22. 267
  23. 483
  24. 303
  25. 288
  26. 240
  27. 142
  28. 229
  29. 184
  30. 266
  31. 95
  32. 208
  33. 436
  34. 396
  35. 458
  36. 199
  37. 464
  38. 254
  39. 321
  40. 142

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