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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 720 · 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. 1.359 + 77 =
  2. 2.159 + 57 =
  3. 3.127 + 59 =
  4. 4.479 + 67 =
  5. 5.448 + 38 =
  6. 6.119 + 97 =
  7. 7.27 + 67 =
  8. 8.111 + 78 =
  9. 9.56 + 37 =
  10. 10.133 + 18 =
  11. 11.478 + 57 =
  12. 12.48 + 89 =
  13. 13.424 + 49 =
  14. 14.232 + 27 =
  15. 15.273 + 29 =
  16. 16.70 + 87 =
  17. 17.333 + 39 =
  18. 18.289 + 49 =
  19. 19.212 + 49 =
  20. 20.485 + 59 =
  21. 21.263 + 58 =
  22. 22.193 + 59 =
  23. 23.397 + 79 =
  24. 24.355 + 17 =
  25. 25.408 + 57 =
  26. 26.484 + 88 =
  27. 27.293 + 28 =
  28. 28.244 + 87 =
  29. 29.292 + 89 =
  30. 30.100 + 37 =
  31. 31.324 + 39 =
  32. 32.174 + 77 =
  33. 33.308 + 69 =
  34. 34.329 + 97 =
  35. 35.50 + 78 =
  36. 36.137 + 57 =
  37. 37.292 + 58 =
  38. 38.483 + 29 =
  39. 39.176 + 68 =
  40. 40.168 + 59 =

Answer key

  1. 436
  2. 216
  3. 186
  4. 546
  5. 486
  6. 216
  7. 94
  8. 189
  9. 93
  10. 151
  11. 535
  12. 137
  13. 473
  14. 259
  15. 302
  16. 157
  17. 372
  18. 338
  19. 261
  20. 544
  21. 321
  22. 252
  23. 476
  24. 372
  25. 465
  26. 572
  27. 321
  28. 331
  29. 381
  30. 137
  31. 363
  32. 251
  33. 377
  34. 426
  35. 128
  36. 194
  37. 350
  38. 512
  39. 244
  40. 227

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