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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 220 · 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. 1.34 + 78 =
  2. 2.117 + 79 =
  3. 3.473 + 29 =
  4. 4.499 + 57 =
  5. 5.191 + 18 =
  6. 6.72 + 37 =
  7. 7.282 + 98 =
  8. 8.329 + 68 =
  9. 9.180 + 47 =
  10. 10.185 + 87 =
  11. 11.213 + 29 =
  12. 12.357 + 17 =
  13. 13.368 + 29 =
  14. 14.185 + 27 =
  15. 15.81 + 79 =
  16. 16.148 + 37 =
  17. 17.212 + 37 =
  18. 18.337 + 97 =
  19. 19.87 + 58 =
  20. 20.249 + 37 =
  21. 21.321 + 89 =
  22. 22.92 + 88 =
  23. 23.314 + 69 =
  24. 24.164 + 58 =
  25. 25.226 + 38 =
  26. 26.467 + 37 =
  27. 27.110 + 87 =
  28. 28.67 + 59 =
  29. 29.339 + 89 =
  30. 30.292 + 57 =
  31. 31.76 + 97 =
  32. 32.406 + 97 =
  33. 33.284 + 49 =
  34. 34.387 + 59 =
  35. 35.378 + 39 =
  36. 36.177 + 38 =
  37. 37.385 + 57 =
  38. 38.234 + 69 =
  39. 39.109 + 38 =
  40. 40.495 + 28 =

Answer key

  1. 112
  2. 196
  3. 502
  4. 556
  5. 209
  6. 109
  7. 380
  8. 397
  9. 227
  10. 272
  11. 242
  12. 374
  13. 397
  14. 212
  15. 160
  16. 185
  17. 249
  18. 434
  19. 145
  20. 286
  21. 410
  22. 180
  23. 383
  24. 222
  25. 264
  26. 504
  27. 197
  28. 126
  29. 428
  30. 349
  31. 173
  32. 503
  33. 333
  34. 446
  35. 417
  36. 215
  37. 442
  38. 303
  39. 147
  40. 523

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