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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 822 · 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. 1.87 + 28 =
  2. 2.260 + 99 =
  3. 3.127 + 37 =
  4. 4.372 + 58 =
  5. 5.100 + 28 =
  6. 6.128 + 87 =
  7. 7.70 + 79 =
  8. 8.270 + 89 =
  9. 9.167 + 68 =
  10. 10.482 + 77 =
  11. 11.55 + 17 =
  12. 12.68 + 27 =
  13. 13.86 + 38 =
  14. 14.102 + 48 =
  15. 15.354 + 57 =
  16. 16.462 + 58 =
  17. 17.317 + 77 =
  18. 18.437 + 37 =
  19. 19.320 + 79 =
  20. 20.28 + 28 =
  21. 21.118 + 77 =
  22. 22.278 + 19 =
  23. 23.307 + 47 =
  24. 24.233 + 39 =
  25. 25.346 + 67 =
  26. 26.84 + 18 =
  27. 27.242 + 49 =
  28. 28.294 + 37 =
  29. 29.367 + 68 =
  30. 30.367 + 97 =
  31. 31.140 + 39 =
  32. 32.37 + 17 =
  33. 33.339 + 39 =
  34. 34.71 + 87 =
  35. 35.122 + 59 =
  36. 36.449 + 47 =
  37. 37.83 + 59 =
  38. 38.428 + 77 =
  39. 39.62 + 27 =
  40. 40.270 + 17 =

Answer key

  1. 115
  2. 359
  3. 164
  4. 430
  5. 128
  6. 215
  7. 149
  8. 359
  9. 235
  10. 559
  11. 72
  12. 95
  13. 124
  14. 150
  15. 411
  16. 520
  17. 394
  18. 474
  19. 399
  20. 56
  21. 195
  22. 297
  23. 354
  24. 272
  25. 413
  26. 102
  27. 291
  28. 331
  29. 435
  30. 464
  31. 179
  32. 54
  33. 378
  34. 158
  35. 181
  36. 496
  37. 142
  38. 505
  39. 89
  40. 287

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