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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 248 · 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. 1.416 + 19 =
  2. 2.34 + 58 =
  3. 3.84 + 87 =
  4. 4.210 + 68 =
  5. 5.307 + 17 =
  6. 6.460 + 79 =
  7. 7.107 + 87 =
  8. 8.291 + 79 =
  9. 9.54 + 99 =
  10. 10.473 + 49 =
  11. 11.466 + 89 =
  12. 12.187 + 19 =
  13. 13.212 + 99 =
  14. 14.180 + 57 =
  15. 15.203 + 89 =
  16. 16.25 + 57 =
  17. 17.177 + 97 =
  18. 18.476 + 19 =
  19. 19.413 + 58 =
  20. 20.377 + 17 =
  21. 21.50 + 39 =
  22. 22.173 + 77 =
  23. 23.298 + 88 =
  24. 24.208 + 97 =
  25. 25.301 + 77 =
  26. 26.93 + 19 =
  27. 27.410 + 27 =
  28. 28.152 + 57 =
  29. 29.112 + 49 =
  30. 30.415 + 19 =
  31. 31.70 + 68 =
  32. 32.265 + 47 =
  33. 33.346 + 89 =
  34. 34.367 + 89 =
  35. 35.393 + 18 =
  36. 36.450 + 68 =
  37. 37.285 + 77 =
  38. 38.414 + 48 =
  39. 39.127 + 88 =
  40. 40.79 + 78 =

Answer key

  1. 435
  2. 92
  3. 171
  4. 278
  5. 324
  6. 539
  7. 194
  8. 370
  9. 153
  10. 522
  11. 555
  12. 206
  13. 311
  14. 237
  15. 292
  16. 82
  17. 274
  18. 495
  19. 471
  20. 394
  21. 89
  22. 250
  23. 386
  24. 305
  25. 378
  26. 112
  27. 437
  28. 209
  29. 161
  30. 434
  31. 138
  32. 312
  33. 435
  34. 456
  35. 411
  36. 518
  37. 362
  38. 462
  39. 215
  40. 157

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