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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 659 · 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. 1.152 + 57 =
  2. 2.131 + 68 =
  3. 3.33 + 18 =
  4. 4.476 + 97 =
  5. 5.396 + 29 =
  6. 6.232 + 77 =
  7. 7.158 + 17 =
  8. 8.175 + 89 =
  9. 9.475 + 38 =
  10. 10.314 + 97 =
  11. 11.268 + 17 =
  12. 12.126 + 37 =
  13. 13.349 + 49 =
  14. 14.114 + 18 =
  15. 15.127 + 39 =
  16. 16.78 + 79 =
  17. 17.197 + 68 =
  18. 18.357 + 88 =
  19. 19.453 + 69 =
  20. 20.102 + 79 =
  21. 21.126 + 39 =
  22. 22.269 + 88 =
  23. 23.251 + 68 =
  24. 24.258 + 17 =
  25. 25.124 + 58 =
  26. 26.31 + 17 =
  27. 27.204 + 69 =
  28. 28.90 + 87 =
  29. 29.157 + 89 =
  30. 30.170 + 49 =
  31. 31.361 + 39 =
  32. 32.199 + 29 =
  33. 33.291 + 48 =
  34. 34.263 + 17 =
  35. 35.60 + 79 =
  36. 36.240 + 77 =
  37. 37.237 + 87 =
  38. 38.172 + 47 =
  39. 39.437 + 59 =
  40. 40.379 + 87 =

Answer key

  1. 209
  2. 199
  3. 51
  4. 573
  5. 425
  6. 309
  7. 175
  8. 264
  9. 513
  10. 411
  11. 285
  12. 163
  13. 398
  14. 132
  15. 166
  16. 157
  17. 265
  18. 445
  19. 522
  20. 181
  21. 165
  22. 357
  23. 319
  24. 275
  25. 182
  26. 48
  27. 273
  28. 177
  29. 246
  30. 219
  31. 400
  32. 228
  33. 339
  34. 280
  35. 139
  36. 317
  37. 324
  38. 219
  39. 496
  40. 466

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