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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 229 · 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. 1.86 + 29 =
  2. 2.122 + 88 =
  3. 3.76 + 67 =
  4. 4.137 + 37 =
  5. 5.194 + 88 =
  6. 6.319 + 89 =
  7. 7.87 + 29 =
  8. 8.187 + 78 =
  9. 9.342 + 67 =
  10. 10.262 + 19 =
  11. 11.77 + 78 =
  12. 12.492 + 17 =
  13. 13.100 + 47 =
  14. 14.493 + 88 =
  15. 15.420 + 69 =
  16. 16.242 + 79 =
  17. 17.487 + 38 =
  18. 18.252 + 17 =
  19. 19.92 + 38 =
  20. 20.155 + 47 =
  21. 21.191 + 69 =
  22. 22.378 + 38 =
  23. 23.282 + 18 =
  24. 24.477 + 77 =
  25. 25.369 + 19 =
  26. 26.163 + 88 =
  27. 27.321 + 57 =
  28. 28.375 + 69 =
  29. 29.53 + 18 =
  30. 30.63 + 68 =
  31. 31.37 + 47 =
  32. 32.113 + 27 =
  33. 33.449 + 28 =
  34. 34.331 + 17 =
  35. 35.407 + 57 =
  36. 36.260 + 58 =
  37. 37.76 + 17 =
  38. 38.441 + 38 =
  39. 39.263 + 69 =
  40. 40.496 + 68 =

Answer key

  1. 115
  2. 210
  3. 143
  4. 174
  5. 282
  6. 408
  7. 116
  8. 265
  9. 409
  10. 281
  11. 155
  12. 509
  13. 147
  14. 581
  15. 489
  16. 321
  17. 525
  18. 269
  19. 130
  20. 202
  21. 260
  22. 416
  23. 300
  24. 554
  25. 388
  26. 251
  27. 378
  28. 444
  29. 71
  30. 131
  31. 84
  32. 140
  33. 477
  34. 348
  35. 464
  36. 318
  37. 93
  38. 479
  39. 332
  40. 564

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