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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 246 · 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 + 28 =
  2. 2.177 + 89 =
  3. 3.119 + 99 =
  4. 4.372 + 98 =
  5. 5.417 + 88 =
  6. 6.43 + 68 =
  7. 7.121 + 47 =
  8. 8.84 + 39 =
  9. 9.177 + 49 =
  10. 10.356 + 67 =
  11. 11.314 + 89 =
  12. 12.75 + 49 =
  13. 13.229 + 39 =
  14. 14.337 + 58 =
  15. 15.436 + 47 =
  16. 16.45 + 78 =
  17. 17.97 + 17 =
  18. 18.476 + 37 =
  19. 19.441 + 49 =
  20. 20.390 + 17 =
  21. 21.99 + 18 =
  22. 22.488 + 68 =
  23. 23.264 + 29 =
  24. 24.411 + 29 =
  25. 25.298 + 99 =
  26. 26.282 + 47 =
  27. 27.451 + 37 =
  28. 28.89 + 79 =
  29. 29.55 + 19 =
  30. 30.485 + 28 =
  31. 31.406 + 19 =
  32. 32.76 + 27 =
  33. 33.223 + 39 =
  34. 34.224 + 58 =
  35. 35.337 + 77 =
  36. 36.186 + 68 =
  37. 37.178 + 97 =
  38. 38.73 + 67 =
  39. 39.257 + 38 =
  40. 40.99 + 49 =

Answer key

  1. 232
  2. 266
  3. 218
  4. 470
  5. 505
  6. 111
  7. 168
  8. 123
  9. 226
  10. 423
  11. 403
  12. 124
  13. 268
  14. 395
  15. 483
  16. 123
  17. 114
  18. 513
  19. 490
  20. 407
  21. 117
  22. 556
  23. 293
  24. 440
  25. 397
  26. 329
  27. 488
  28. 168
  29. 74
  30. 513
  31. 425
  32. 103
  33. 262
  34. 282
  35. 414
  36. 254
  37. 275
  38. 140
  39. 295
  40. 148

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