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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 228 · 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. 1.199 + 17 =
  2. 2.79 + 87 =
  3. 3.159 + 88 =
  4. 4.181 + 98 =
  5. 5.402 + 77 =
  6. 6.240 + 98 =
  7. 7.108 + 28 =
  8. 8.401 + 28 =
  9. 9.244 + 69 =
  10. 10.135 + 29 =
  11. 11.79 + 27 =
  12. 12.274 + 47 =
  13. 13.91 + 68 =
  14. 14.472 + 27 =
  15. 15.227 + 38 =
  16. 16.172 + 68 =
  17. 17.497 + 99 =
  18. 18.399 + 59 =
  19. 19.341 + 29 =
  20. 20.338 + 59 =
  21. 21.253 + 59 =
  22. 22.311 + 69 =
  23. 23.115 + 88 =
  24. 24.99 + 69 =
  25. 25.486 + 59 =
  26. 26.198 + 19 =
  27. 27.351 + 68 =
  28. 28.75 + 77 =
  29. 29.395 + 17 =
  30. 30.408 + 47 =
  31. 31.125 + 39 =
  32. 32.204 + 57 =
  33. 33.230 + 38 =
  34. 34.166 + 17 =
  35. 35.101 + 18 =
  36. 36.477 + 78 =
  37. 37.445 + 19 =
  38. 38.107 + 88 =
  39. 39.412 + 29 =
  40. 40.31 + 97 =

Answer key

  1. 216
  2. 166
  3. 247
  4. 279
  5. 479
  6. 338
  7. 136
  8. 429
  9. 313
  10. 164
  11. 106
  12. 321
  13. 159
  14. 499
  15. 265
  16. 240
  17. 596
  18. 458
  19. 370
  20. 397
  21. 312
  22. 380
  23. 203
  24. 168
  25. 545
  26. 217
  27. 419
  28. 152
  29. 412
  30. 455
  31. 164
  32. 261
  33. 268
  34. 183
  35. 119
  36. 555
  37. 464
  38. 195
  39. 441
  40. 128

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