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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 710 · 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. 1.36 + 18 =
  2. 2.315 + 59 =
  3. 3.190 + 29 =
  4. 4.147 + 27 =
  5. 5.269 + 58 =
  6. 6.266 + 97 =
  7. 7.41 + 59 =
  8. 8.389 + 27 =
  9. 9.117 + 78 =
  10. 10.320 + 39 =
  11. 11.138 + 47 =
  12. 12.153 + 27 =
  13. 13.107 + 69 =
  14. 14.37 + 38 =
  15. 15.354 + 87 =
  16. 16.307 + 68 =
  17. 17.175 + 17 =
  18. 18.252 + 57 =
  19. 19.73 + 37 =
  20. 20.47 + 87 =
  21. 21.196 + 77 =
  22. 22.361 + 69 =
  23. 23.182 + 77 =
  24. 24.102 + 57 =
  25. 25.405 + 29 =
  26. 26.397 + 38 =
  27. 27.196 + 87 =
  28. 28.182 + 59 =
  29. 29.36 + 39 =
  30. 30.317 + 77 =
  31. 31.437 + 57 =
  32. 32.200 + 57 =
  33. 33.283 + 99 =
  34. 34.274 + 38 =
  35. 35.240 + 37 =
  36. 36.295 + 29 =
  37. 37.385 + 68 =
  38. 38.443 + 18 =
  39. 39.69 + 78 =
  40. 40.379 + 89 =

Answer key

  1. 54
  2. 374
  3. 219
  4. 174
  5. 327
  6. 363
  7. 100
  8. 416
  9. 195
  10. 359
  11. 185
  12. 180
  13. 176
  14. 75
  15. 441
  16. 375
  17. 192
  18. 309
  19. 110
  20. 134
  21. 273
  22. 430
  23. 259
  24. 159
  25. 434
  26. 435
  27. 283
  28. 241
  29. 75
  30. 394
  31. 494
  32. 257
  33. 382
  34. 312
  35. 277
  36. 324
  37. 453
  38. 461
  39. 147
  40. 468

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