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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 358 · 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. 1.121 + 67 =
  2. 2.134 + 27 =
  3. 3.33 + 69 =
  4. 4.388 + 28 =
  5. 5.238 + 38 =
  6. 6.125 + 37 =
  7. 7.148 + 57 =
  8. 8.417 + 48 =
  9. 9.300 + 28 =
  10. 10.194 + 89 =
  11. 11.106 + 97 =
  12. 12.263 + 68 =
  13. 13.402 + 78 =
  14. 14.52 + 47 =
  15. 15.471 + 99 =
  16. 16.267 + 87 =
  17. 17.453 + 27 =
  18. 18.191 + 88 =
  19. 19.169 + 68 =
  20. 20.289 + 78 =
  21. 21.327 + 77 =
  22. 22.127 + 87 =
  23. 23.76 + 27 =
  24. 24.372 + 57 =
  25. 25.67 + 79 =
  26. 26.195 + 58 =
  27. 27.231 + 99 =
  28. 28.309 + 88 =
  29. 29.83 + 57 =
  30. 30.110 + 88 =
  31. 31.57 + 58 =
  32. 32.110 + 68 =
  33. 33.248 + 37 =
  34. 34.47 + 48 =
  35. 35.452 + 28 =
  36. 36.45 + 69 =
  37. 37.430 + 38 =
  38. 38.205 + 17 =
  39. 39.443 + 47 =
  40. 40.173 + 67 =

Answer key

  1. 188
  2. 161
  3. 102
  4. 416
  5. 276
  6. 162
  7. 205
  8. 465
  9. 328
  10. 283
  11. 203
  12. 331
  13. 480
  14. 99
  15. 570
  16. 354
  17. 480
  18. 279
  19. 237
  20. 367
  21. 404
  22. 214
  23. 103
  24. 429
  25. 146
  26. 253
  27. 330
  28. 397
  29. 140
  30. 198
  31. 115
  32. 178
  33. 285
  34. 95
  35. 480
  36. 114
  37. 468
  38. 222
  39. 490
  40. 240

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