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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 319 · 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. 1.385 + 38 =
  2. 2.195 + 57 =
  3. 3.385 + 89 =
  4. 4.264 + 29 =
  5. 5.294 + 17 =
  6. 6.132 + 87 =
  7. 7.185 + 97 =
  8. 8.444 + 77 =
  9. 9.56 + 57 =
  10. 10.266 + 47 =
  11. 11.466 + 37 =
  12. 12.136 + 88 =
  13. 13.255 + 58 =
  14. 14.69 + 59 =
  15. 15.270 + 79 =
  16. 16.355 + 68 =
  17. 17.124 + 89 =
  18. 18.363 + 38 =
  19. 19.316 + 27 =
  20. 20.411 + 79 =
  21. 21.228 + 59 =
  22. 22.328 + 27 =
  23. 23.294 + 28 =
  24. 24.436 + 37 =
  25. 25.54 + 79 =
  26. 26.304 + 89 =
  27. 27.76 + 89 =
  28. 28.357 + 77 =
  29. 29.268 + 67 =
  30. 30.483 + 28 =
  31. 31.161 + 88 =
  32. 32.58 + 19 =
  33. 33.40 + 78 =
  34. 34.91 + 68 =
  35. 35.341 + 18 =
  36. 36.49 + 78 =
  37. 37.30 + 49 =
  38. 38.377 + 37 =
  39. 39.440 + 69 =
  40. 40.304 + 88 =

Answer key

  1. 423
  2. 252
  3. 474
  4. 293
  5. 311
  6. 219
  7. 282
  8. 521
  9. 113
  10. 313
  11. 503
  12. 224
  13. 313
  14. 128
  15. 349
  16. 423
  17. 213
  18. 401
  19. 343
  20. 490
  21. 287
  22. 355
  23. 322
  24. 473
  25. 133
  26. 393
  27. 165
  28. 434
  29. 335
  30. 511
  31. 249
  32. 77
  33. 118
  34. 159
  35. 359
  36. 127
  37. 79
  38. 414
  39. 509
  40. 392

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