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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 33 · 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. 1.153 + 48 =
  2. 2.55 + 19 =
  3. 3.218 + 58 =
  4. 4.452 + 38 =
  5. 5.326 + 19 =
  6. 6.456 + 79 =
  7. 7.85 + 68 =
  8. 8.148 + 59 =
  9. 9.68 + 89 =
  10. 10.86 + 47 =
  11. 11.285 + 27 =
  12. 12.299 + 48 =
  13. 13.362 + 68 =
  14. 14.325 + 57 =
  15. 15.498 + 87 =
  16. 16.98 + 19 =
  17. 17.189 + 37 =
  18. 18.248 + 57 =
  19. 19.92 + 98 =
  20. 20.452 + 49 =
  21. 21.241 + 97 =
  22. 22.323 + 47 =
  23. 23.319 + 77 =
  24. 24.389 + 18 =
  25. 25.133 + 87 =
  26. 26.82 + 39 =
  27. 27.143 + 67 =
  28. 28.129 + 27 =
  29. 29.239 + 18 =
  30. 30.252 + 89 =
  31. 31.410 + 18 =
  32. 32.137 + 87 =
  33. 33.79 + 97 =
  34. 34.199 + 79 =
  35. 35.401 + 28 =
  36. 36.287 + 38 =
  37. 37.463 + 39 =
  38. 38.198 + 37 =
  39. 39.242 + 38 =
  40. 40.216 + 97 =

Answer key

  1. 201
  2. 74
  3. 276
  4. 490
  5. 345
  6. 535
  7. 153
  8. 207
  9. 157
  10. 133
  11. 312
  12. 347
  13. 430
  14. 382
  15. 585
  16. 117
  17. 226
  18. 305
  19. 190
  20. 501
  21. 338
  22. 370
  23. 396
  24. 407
  25. 220
  26. 121
  27. 210
  28. 156
  29. 257
  30. 341
  31. 428
  32. 224
  33. 176
  34. 278
  35. 429
  36. 325
  37. 502
  38. 235
  39. 280
  40. 313

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