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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 378 · 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. 1.112 + 69 =
  2. 2.73 + 57 =
  3. 3.339 + 99 =
  4. 4.492 + 39 =
  5. 5.206 + 97 =
  6. 6.295 + 47 =
  7. 7.71 + 87 =
  8. 8.470 + 89 =
  9. 9.147 + 77 =
  10. 10.110 + 77 =
  11. 11.119 + 87 =
  12. 12.138 + 18 =
  13. 13.97 + 87 =
  14. 14.256 + 97 =
  15. 15.149 + 59 =
  16. 16.310 + 27 =
  17. 17.438 + 37 =
  18. 18.381 + 88 =
  19. 19.212 + 17 =
  20. 20.102 + 47 =
  21. 21.82 + 68 =
  22. 22.439 + 97 =
  23. 23.43 + 89 =
  24. 24.337 + 69 =
  25. 25.167 + 39 =
  26. 26.273 + 29 =
  27. 27.419 + 87 =
  28. 28.295 + 29 =
  29. 29.79 + 17 =
  30. 30.298 + 97 =
  31. 31.68 + 79 =
  32. 32.312 + 97 =
  33. 33.220 + 18 =
  34. 34.253 + 59 =
  35. 35.441 + 49 =
  36. 36.327 + 39 =
  37. 37.332 + 69 =
  38. 38.464 + 47 =
  39. 39.214 + 58 =
  40. 40.297 + 47 =

Answer key

  1. 181
  2. 130
  3. 438
  4. 531
  5. 303
  6. 342
  7. 158
  8. 559
  9. 224
  10. 187
  11. 206
  12. 156
  13. 184
  14. 353
  15. 208
  16. 337
  17. 475
  18. 469
  19. 229
  20. 149
  21. 150
  22. 536
  23. 132
  24. 406
  25. 206
  26. 302
  27. 506
  28. 324
  29. 96
  30. 395
  31. 147
  32. 409
  33. 238
  34. 312
  35. 490
  36. 366
  37. 401
  38. 511
  39. 272
  40. 344

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