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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 385 · 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. 1.446 + 38 =
  2. 2.241 + 49 =
  3. 3.265 + 59 =
  4. 4.164 + 68 =
  5. 5.159 + 98 =
  6. 6.306 + 37 =
  7. 7.39 + 59 =
  8. 8.267 + 78 =
  9. 9.57 + 67 =
  10. 10.41 + 68 =
  11. 11.372 + 79 =
  12. 12.74 + 69 =
  13. 13.396 + 27 =
  14. 14.392 + 29 =
  15. 15.323 + 37 =
  16. 16.478 + 47 =
  17. 17.353 + 17 =
  18. 18.71 + 68 =
  19. 19.209 + 89 =
  20. 20.194 + 39 =
  21. 21.155 + 58 =
  22. 22.135 + 37 =
  23. 23.61 + 68 =
  24. 24.207 + 67 =
  25. 25.274 + 89 =
  26. 26.486 + 19 =
  27. 27.343 + 59 =
  28. 28.149 + 67 =
  29. 29.184 + 67 =
  30. 30.62 + 27 =
  31. 31.363 + 87 =
  32. 32.480 + 69 =
  33. 33.384 + 39 =
  34. 34.136 + 57 =
  35. 35.155 + 19 =
  36. 36.63 + 99 =
  37. 37.258 + 68 =
  38. 38.458 + 79 =
  39. 39.45 + 88 =
  40. 40.323 + 77 =

Answer key

  1. 484
  2. 290
  3. 324
  4. 232
  5. 257
  6. 343
  7. 98
  8. 345
  9. 124
  10. 109
  11. 451
  12. 143
  13. 423
  14. 421
  15. 360
  16. 525
  17. 370
  18. 139
  19. 298
  20. 233
  21. 213
  22. 172
  23. 129
  24. 274
  25. 363
  26. 505
  27. 402
  28. 216
  29. 251
  30. 89
  31. 450
  32. 549
  33. 423
  34. 193
  35. 174
  36. 162
  37. 326
  38. 537
  39. 133
  40. 400

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