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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 283 · 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. 1.259 + 97 =
  2. 2.484 + 27 =
  3. 3.106 + 58 =
  4. 4.106 + 28 =
  5. 5.78 + 57 =
  6. 6.274 + 78 =
  7. 7.272 + 28 =
  8. 8.284 + 97 =
  9. 9.102 + 69 =
  10. 10.210 + 88 =
  11. 11.374 + 88 =
  12. 12.345 + 59 =
  13. 13.371 + 19 =
  14. 14.474 + 79 =
  15. 15.98 + 88 =
  16. 16.488 + 37 =
  17. 17.439 + 29 =
  18. 18.423 + 48 =
  19. 19.247 + 29 =
  20. 20.113 + 98 =
  21. 21.339 + 97 =
  22. 22.187 + 19 =
  23. 23.257 + 28 =
  24. 24.70 + 57 =
  25. 25.43 + 57 =
  26. 26.401 + 57 =
  27. 27.397 + 48 =
  28. 28.176 + 88 =
  29. 29.148 + 78 =
  30. 30.301 + 48 =
  31. 31.474 + 58 =
  32. 32.486 + 97 =
  33. 33.96 + 77 =
  34. 34.40 + 58 =
  35. 35.256 + 37 =
  36. 36.80 + 79 =
  37. 37.411 + 68 =
  38. 38.210 + 17 =
  39. 39.469 + 17 =
  40. 40.482 + 69 =

Answer key

  1. 356
  2. 511
  3. 164
  4. 134
  5. 135
  6. 352
  7. 300
  8. 381
  9. 171
  10. 298
  11. 462
  12. 404
  13. 390
  14. 553
  15. 186
  16. 525
  17. 468
  18. 471
  19. 276
  20. 211
  21. 436
  22. 206
  23. 285
  24. 127
  25. 100
  26. 458
  27. 445
  28. 264
  29. 226
  30. 349
  31. 532
  32. 583
  33. 173
  34. 98
  35. 293
  36. 159
  37. 479
  38. 227
  39. 486
  40. 551

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