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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 611 · 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. 1.480 + 88 =
  2. 2.76 + 78 =
  3. 3.58 + 17 =
  4. 4.400 + 87 =
  5. 5.445 + 37 =
  6. 6.38 + 68 =
  7. 7.100 + 98 =
  8. 8.430 + 48 =
  9. 9.404 + 59 =
  10. 10.27 + 88 =
  11. 11.97 + 78 =
  12. 12.337 + 27 =
  13. 13.189 + 19 =
  14. 14.161 + 97 =
  15. 15.308 + 29 =
  16. 16.204 + 57 =
  17. 17.492 + 47 =
  18. 18.85 + 49 =
  19. 19.453 + 68 =
  20. 20.133 + 89 =
  21. 21.204 + 77 =
  22. 22.413 + 57 =
  23. 23.467 + 49 =
  24. 24.443 + 37 =
  25. 25.199 + 57 =
  26. 26.212 + 57 =
  27. 27.35 + 69 =
  28. 28.215 + 39 =
  29. 29.253 + 77 =
  30. 30.278 + 17 =
  31. 31.310 + 79 =
  32. 32.223 + 17 =
  33. 33.492 + 87 =
  34. 34.181 + 79 =
  35. 35.224 + 48 =
  36. 36.210 + 67 =
  37. 37.85 + 38 =
  38. 38.342 + 49 =
  39. 39.49 + 68 =
  40. 40.194 + 67 =

Answer key

  1. 568
  2. 154
  3. 75
  4. 487
  5. 482
  6. 106
  7. 198
  8. 478
  9. 463
  10. 115
  11. 175
  12. 364
  13. 208
  14. 258
  15. 337
  16. 261
  17. 539
  18. 134
  19. 521
  20. 222
  21. 281
  22. 470
  23. 516
  24. 480
  25. 256
  26. 269
  27. 104
  28. 254
  29. 330
  30. 295
  31. 389
  32. 240
  33. 579
  34. 260
  35. 272
  36. 277
  37. 123
  38. 391
  39. 117
  40. 261

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