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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 65 · 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. 1.105 + 47 =
  2. 2.301 + 28 =
  3. 3.99 + 38 =
  4. 4.166 + 89 =
  5. 5.472 + 67 =
  6. 6.396 + 48 =
  7. 7.263 + 37 =
  8. 8.74 + 19 =
  9. 9.209 + 37 =
  10. 10.420 + 38 =
  11. 11.145 + 77 =
  12. 12.63 + 17 =
  13. 13.251 + 39 =
  14. 14.107 + 77 =
  15. 15.380 + 17 =
  16. 16.42 + 58 =
  17. 17.382 + 19 =
  18. 18.191 + 59 =
  19. 19.40 + 68 =
  20. 20.136 + 19 =
  21. 21.438 + 38 =
  22. 22.99 + 77 =
  23. 23.429 + 67 =
  24. 24.78 + 29 =
  25. 25.343 + 28 =
  26. 26.85 + 47 =
  27. 27.239 + 27 =
  28. 28.83 + 67 =
  29. 29.481 + 78 =
  30. 30.125 + 87 =
  31. 31.97 + 47 =
  32. 32.269 + 18 =
  33. 33.497 + 18 =
  34. 34.246 + 59 =
  35. 35.419 + 39 =
  36. 36.149 + 47 =
  37. 37.270 + 69 =
  38. 38.371 + 69 =
  39. 39.465 + 18 =
  40. 40.209 + 47 =

Answer key

  1. 152
  2. 329
  3. 137
  4. 255
  5. 539
  6. 444
  7. 300
  8. 93
  9. 246
  10. 458
  11. 222
  12. 80
  13. 290
  14. 184
  15. 397
  16. 100
  17. 401
  18. 250
  19. 108
  20. 155
  21. 476
  22. 176
  23. 496
  24. 107
  25. 371
  26. 132
  27. 266
  28. 150
  29. 559
  30. 212
  31. 144
  32. 287
  33. 515
  34. 305
  35. 458
  36. 196
  37. 339
  38. 440
  39. 483
  40. 256

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