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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 601 · 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. 1.204 + 78 =
  2. 2.341 + 17 =
  3. 3.127 + 67 =
  4. 4.31 + 28 =
  5. 5.350 + 89 =
  6. 6.134 + 18 =
  7. 7.52 + 17 =
  8. 8.321 + 27 =
  9. 9.191 + 77 =
  10. 10.119 + 67 =
  11. 11.294 + 69 =
  12. 12.435 + 69 =
  13. 13.91 + 79 =
  14. 14.79 + 98 =
  15. 15.480 + 87 =
  16. 16.447 + 98 =
  17. 17.483 + 39 =
  18. 18.137 + 27 =
  19. 19.453 + 18 =
  20. 20.499 + 17 =
  21. 21.279 + 38 =
  22. 22.144 + 49 =
  23. 23.314 + 58 =
  24. 24.249 + 89 =
  25. 25.433 + 38 =
  26. 26.145 + 48 =
  27. 27.305 + 28 =
  28. 28.285 + 18 =
  29. 29.457 + 17 =
  30. 30.345 + 88 =
  31. 31.66 + 49 =
  32. 32.420 + 27 =
  33. 33.241 + 39 =
  34. 34.211 + 59 =
  35. 35.159 + 98 =
  36. 36.46 + 79 =
  37. 37.71 + 37 =
  38. 38.494 + 57 =
  39. 39.291 + 17 =
  40. 40.31 + 88 =

Answer key

  1. 282
  2. 358
  3. 194
  4. 59
  5. 439
  6. 152
  7. 69
  8. 348
  9. 268
  10. 186
  11. 363
  12. 504
  13. 170
  14. 177
  15. 567
  16. 545
  17. 522
  18. 164
  19. 471
  20. 516
  21. 317
  22. 193
  23. 372
  24. 338
  25. 471
  26. 193
  27. 333
  28. 303
  29. 474
  30. 433
  31. 115
  32. 447
  33. 280
  34. 270
  35. 257
  36. 125
  37. 108
  38. 551
  39. 308
  40. 119

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