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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 196 · 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. 1.118 + 99 =
  2. 2.29 + 39 =
  3. 3.73 + 39 =
  4. 4.64 + 47 =
  5. 5.320 + 29 =
  6. 6.146 + 48 =
  7. 7.178 + 87 =
  8. 8.196 + 27 =
  9. 9.497 + 68 =
  10. 10.280 + 97 =
  11. 11.284 + 47 =
  12. 12.229 + 39 =
  13. 13.345 + 78 =
  14. 14.372 + 59 =
  15. 15.117 + 79 =
  16. 16.115 + 29 =
  17. 17.250 + 99 =
  18. 18.197 + 47 =
  19. 19.302 + 37 =
  20. 20.257 + 88 =
  21. 21.340 + 59 =
  22. 22.250 + 69 =
  23. 23.357 + 99 =
  24. 24.32 + 49 =
  25. 25.486 + 87 =
  26. 26.79 + 88 =
  27. 27.258 + 89 =
  28. 28.396 + 88 =
  29. 29.39 + 67 =
  30. 30.291 + 68 =
  31. 31.224 + 17 =
  32. 32.82 + 68 =
  33. 33.297 + 57 =
  34. 34.428 + 99 =
  35. 35.147 + 87 =
  36. 36.229 + 28 =
  37. 37.91 + 59 =
  38. 38.211 + 29 =
  39. 39.210 + 77 =
  40. 40.383 + 28 =

Answer key

  1. 217
  2. 68
  3. 112
  4. 111
  5. 349
  6. 194
  7. 265
  8. 223
  9. 565
  10. 377
  11. 331
  12. 268
  13. 423
  14. 431
  15. 196
  16. 144
  17. 349
  18. 244
  19. 339
  20. 345
  21. 399
  22. 319
  23. 456
  24. 81
  25. 573
  26. 167
  27. 347
  28. 484
  29. 106
  30. 359
  31. 241
  32. 150
  33. 354
  34. 527
  35. 234
  36. 257
  37. 150
  38. 240
  39. 287
  40. 411

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