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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 250 · 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. 1.418 + 87 =
  2. 2.207 + 87 =
  3. 3.320 + 58 =
  4. 4.132 + 98 =
  5. 5.362 + 37 =
  6. 6.32 + 47 =
  7. 7.235 + 28 =
  8. 8.476 + 29 =
  9. 9.125 + 67 =
  10. 10.311 + 78 =
  11. 11.261 + 37 =
  12. 12.127 + 17 =
  13. 13.47 + 38 =
  14. 14.151 + 39 =
  15. 15.152 + 67 =
  16. 16.105 + 69 =
  17. 17.168 + 87 =
  18. 18.415 + 29 =
  19. 19.84 + 58 =
  20. 20.51 + 97 =
  21. 21.261 + 17 =
  22. 22.139 + 98 =
  23. 23.419 + 28 =
  24. 24.192 + 17 =
  25. 25.163 + 97 =
  26. 26.110 + 68 =
  27. 27.142 + 49 =
  28. 28.409 + 59 =
  29. 29.285 + 19 =
  30. 30.319 + 59 =
  31. 31.270 + 78 =
  32. 32.411 + 78 =
  33. 33.396 + 67 =
  34. 34.79 + 67 =
  35. 35.316 + 57 =
  36. 36.260 + 59 =
  37. 37.452 + 68 =
  38. 38.308 + 59 =
  39. 39.107 + 57 =
  40. 40.241 + 29 =

Answer key

  1. 505
  2. 294
  3. 378
  4. 230
  5. 399
  6. 79
  7. 263
  8. 505
  9. 192
  10. 389
  11. 298
  12. 144
  13. 85
  14. 190
  15. 219
  16. 174
  17. 255
  18. 444
  19. 142
  20. 148
  21. 278
  22. 237
  23. 447
  24. 209
  25. 260
  26. 178
  27. 191
  28. 468
  29. 304
  30. 378
  31. 348
  32. 489
  33. 463
  34. 146
  35. 373
  36. 319
  37. 520
  38. 367
  39. 164
  40. 270

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