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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 743 · 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. 1.345 + 18 =
  2. 2.62 + 77 =
  3. 3.95 + 79 =
  4. 4.43 + 27 =
  5. 5.228 + 99 =
  6. 6.163 + 78 =
  7. 7.488 + 68 =
  8. 8.454 + 39 =
  9. 9.281 + 78 =
  10. 10.363 + 78 =
  11. 11.113 + 88 =
  12. 12.303 + 98 =
  13. 13.440 + 88 =
  14. 14.53 + 88 =
  15. 15.285 + 48 =
  16. 16.103 + 28 =
  17. 17.478 + 97 =
  18. 18.439 + 27 =
  19. 19.36 + 88 =
  20. 20.255 + 67 =
  21. 21.88 + 47 =
  22. 22.249 + 79 =
  23. 23.93 + 67 =
  24. 24.329 + 19 =
  25. 25.402 + 38 =
  26. 26.280 + 28 =
  27. 27.40 + 39 =
  28. 28.110 + 39 =
  29. 29.492 + 17 =
  30. 30.222 + 18 =
  31. 31.64 + 48 =
  32. 32.95 + 17 =
  33. 33.80 + 49 =
  34. 34.417 + 88 =
  35. 35.195 + 98 =
  36. 36.188 + 49 =
  37. 37.260 + 58 =
  38. 38.432 + 47 =
  39. 39.183 + 18 =
  40. 40.465 + 19 =

Answer key

  1. 363
  2. 139
  3. 174
  4. 70
  5. 327
  6. 241
  7. 556
  8. 493
  9. 359
  10. 441
  11. 201
  12. 401
  13. 528
  14. 141
  15. 333
  16. 131
  17. 575
  18. 466
  19. 124
  20. 322
  21. 135
  22. 328
  23. 160
  24. 348
  25. 440
  26. 308
  27. 79
  28. 149
  29. 509
  30. 240
  31. 112
  32. 112
  33. 129
  34. 505
  35. 293
  36. 237
  37. 318
  38. 479
  39. 201
  40. 484

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