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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 595 · 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. 1.350 + 79 =
  2. 2.285 + 88 =
  3. 3.434 + 77 =
  4. 4.298 + 97 =
  5. 5.41 + 59 =
  6. 6.393 + 98 =
  7. 7.431 + 17 =
  8. 8.268 + 49 =
  9. 9.33 + 69 =
  10. 10.174 + 79 =
  11. 11.439 + 77 =
  12. 12.133 + 97 =
  13. 13.344 + 59 =
  14. 14.193 + 19 =
  15. 15.161 + 47 =
  16. 16.53 + 57 =
  17. 17.237 + 49 =
  18. 18.126 + 97 =
  19. 19.347 + 48 =
  20. 20.105 + 97 =
  21. 21.161 + 87 =
  22. 22.33 + 27 =
  23. 23.307 + 67 =
  24. 24.146 + 19 =
  25. 25.350 + 87 =
  26. 26.191 + 28 =
  27. 27.330 + 37 =
  28. 28.286 + 37 =
  29. 29.94 + 97 =
  30. 30.29 + 77 =
  31. 31.93 + 89 =
  32. 32.319 + 67 =
  33. 33.330 + 87 =
  34. 34.74 + 18 =
  35. 35.179 + 58 =
  36. 36.315 + 48 =
  37. 37.400 + 87 =
  38. 38.224 + 98 =
  39. 39.290 + 89 =
  40. 40.489 + 39 =

Answer key

  1. 429
  2. 373
  3. 511
  4. 395
  5. 100
  6. 491
  7. 448
  8. 317
  9. 102
  10. 253
  11. 516
  12. 230
  13. 403
  14. 212
  15. 208
  16. 110
  17. 286
  18. 223
  19. 395
  20. 202
  21. 248
  22. 60
  23. 374
  24. 165
  25. 437
  26. 219
  27. 367
  28. 323
  29. 191
  30. 106
  31. 182
  32. 386
  33. 417
  34. 92
  35. 237
  36. 363
  37. 487
  38. 322
  39. 379
  40. 528

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