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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 680 · 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. 1.488 + 79 =
  2. 2.306 + 47 =
  3. 3.188 + 77 =
  4. 4.351 + 78 =
  5. 5.147 + 98 =
  6. 6.170 + 37 =
  7. 7.180 + 77 =
  8. 8.269 + 17 =
  9. 9.160 + 19 =
  10. 10.217 + 68 =
  11. 11.59 + 59 =
  12. 12.403 + 47 =
  13. 13.212 + 79 =
  14. 14.131 + 27 =
  15. 15.118 + 18 =
  16. 16.55 + 17 =
  17. 17.484 + 37 =
  18. 18.425 + 68 =
  19. 19.137 + 18 =
  20. 20.414 + 89 =
  21. 21.164 + 27 =
  22. 22.404 + 37 =
  23. 23.70 + 87 =
  24. 24.177 + 88 =
  25. 25.370 + 47 =
  26. 26.36 + 18 =
  27. 27.467 + 27 =
  28. 28.146 + 69 =
  29. 29.385 + 39 =
  30. 30.435 + 57 =
  31. 31.85 + 37 =
  32. 32.90 + 18 =
  33. 33.44 + 17 =
  34. 34.449 + 79 =
  35. 35.35 + 78 =
  36. 36.449 + 69 =
  37. 37.80 + 87 =
  38. 38.131 + 77 =
  39. 39.269 + 97 =
  40. 40.144 + 27 =

Answer key

  1. 567
  2. 353
  3. 265
  4. 429
  5. 245
  6. 207
  7. 257
  8. 286
  9. 179
  10. 285
  11. 118
  12. 450
  13. 291
  14. 158
  15. 136
  16. 72
  17. 521
  18. 493
  19. 155
  20. 503
  21. 191
  22. 441
  23. 157
  24. 265
  25. 417
  26. 54
  27. 494
  28. 215
  29. 424
  30. 492
  31. 122
  32. 108
  33. 61
  34. 528
  35. 113
  36. 518
  37. 167
  38. 208
  39. 366
  40. 171

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