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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 331 · 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. 1.157 + 87 =
  2. 2.313 + 39 =
  3. 3.126 + 17 =
  4. 4.196 + 89 =
  5. 5.484 + 28 =
  6. 6.58 + 37 =
  7. 7.371 + 38 =
  8. 8.322 + 58 =
  9. 9.67 + 57 =
  10. 10.38 + 78 =
  11. 11.288 + 17 =
  12. 12.161 + 27 =
  13. 13.250 + 88 =
  14. 14.166 + 58 =
  15. 15.174 + 39 =
  16. 16.336 + 39 =
  17. 17.167 + 59 =
  18. 18.382 + 97 =
  19. 19.240 + 88 =
  20. 20.191 + 57 =
  21. 21.335 + 87 =
  22. 22.27 + 89 =
  23. 23.59 + 37 =
  24. 24.217 + 39 =
  25. 25.197 + 78 =
  26. 26.254 + 37 =
  27. 27.467 + 67 =
  28. 28.98 + 67 =
  29. 29.348 + 48 =
  30. 30.381 + 89 =
  31. 31.443 + 88 =
  32. 32.233 + 78 =
  33. 33.68 + 67 =
  34. 34.273 + 38 =
  35. 35.425 + 87 =
  36. 36.411 + 28 =
  37. 37.316 + 69 =
  38. 38.272 + 48 =
  39. 39.63 + 47 =
  40. 40.265 + 18 =

Answer key

  1. 244
  2. 352
  3. 143
  4. 285
  5. 512
  6. 95
  7. 409
  8. 380
  9. 124
  10. 116
  11. 305
  12. 188
  13. 338
  14. 224
  15. 213
  16. 375
  17. 226
  18. 479
  19. 328
  20. 248
  21. 422
  22. 116
  23. 96
  24. 256
  25. 275
  26. 291
  27. 534
  28. 165
  29. 396
  30. 470
  31. 531
  32. 311
  33. 135
  34. 311
  35. 512
  36. 439
  37. 385
  38. 320
  39. 110
  40. 283

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