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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 336 · 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. 1.415 + 89 =
  2. 2.59 + 17 =
  3. 3.184 + 78 =
  4. 4.375 + 37 =
  5. 5.408 + 37 =
  6. 6.320 + 27 =
  7. 7.412 + 28 =
  8. 8.256 + 48 =
  9. 9.56 + 78 =
  10. 10.29 + 79 =
  11. 11.87 + 38 =
  12. 12.495 + 38 =
  13. 13.329 + 17 =
  14. 14.130 + 97 =
  15. 15.446 + 97 =
  16. 16.131 + 19 =
  17. 17.161 + 87 =
  18. 18.29 + 89 =
  19. 19.106 + 57 =
  20. 20.344 + 78 =
  21. 21.102 + 38 =
  22. 22.89 + 97 =
  23. 23.242 + 57 =
  24. 24.441 + 39 =
  25. 25.172 + 97 =
  26. 26.311 + 38 =
  27. 27.180 + 77 =
  28. 28.436 + 97 =
  29. 29.388 + 99 =
  30. 30.310 + 49 =
  31. 31.484 + 68 =
  32. 32.350 + 17 =
  33. 33.300 + 97 =
  34. 34.194 + 18 =
  35. 35.92 + 97 =
  36. 36.114 + 97 =
  37. 37.466 + 29 =
  38. 38.154 + 47 =
  39. 39.190 + 97 =
  40. 40.335 + 57 =

Answer key

  1. 504
  2. 76
  3. 262
  4. 412
  5. 445
  6. 347
  7. 440
  8. 304
  9. 134
  10. 108
  11. 125
  12. 533
  13. 346
  14. 227
  15. 543
  16. 150
  17. 248
  18. 118
  19. 163
  20. 422
  21. 140
  22. 186
  23. 299
  24. 480
  25. 269
  26. 349
  27. 257
  28. 533
  29. 487
  30. 359
  31. 552
  32. 367
  33. 397
  34. 212
  35. 189
  36. 211
  37. 495
  38. 201
  39. 287
  40. 392

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