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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 392 · 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. 1.96 + 67 =
  2. 2.221 + 79 =
  3. 3.85 + 29 =
  4. 4.269 + 17 =
  5. 5.494 + 17 =
  6. 6.279 + 19 =
  7. 7.154 + 48 =
  8. 8.325 + 47 =
  9. 9.380 + 77 =
  10. 10.343 + 19 =
  11. 11.55 + 57 =
  12. 12.149 + 17 =
  13. 13.174 + 78 =
  14. 14.211 + 27 =
  15. 15.160 + 88 =
  16. 16.479 + 47 =
  17. 17.302 + 88 =
  18. 18.182 + 58 =
  19. 19.354 + 58 =
  20. 20.468 + 48 =
  21. 21.99 + 57 =
  22. 22.285 + 27 =
  23. 23.157 + 19 =
  24. 24.231 + 39 =
  25. 25.166 + 38 =
  26. 26.116 + 88 =
  27. 27.255 + 98 =
  28. 28.137 + 28 =
  29. 29.192 + 79 =
  30. 30.472 + 57 =
  31. 31.456 + 37 =
  32. 32.142 + 39 =
  33. 33.304 + 18 =
  34. 34.193 + 68 =
  35. 35.125 + 87 =
  36. 36.130 + 88 =
  37. 37.340 + 57 =
  38. 38.252 + 17 =
  39. 39.272 + 58 =
  40. 40.350 + 17 =

Answer key

  1. 163
  2. 300
  3. 114
  4. 286
  5. 511
  6. 298
  7. 202
  8. 372
  9. 457
  10. 362
  11. 112
  12. 166
  13. 252
  14. 238
  15. 248
  16. 526
  17. 390
  18. 240
  19. 412
  20. 516
  21. 156
  22. 312
  23. 176
  24. 270
  25. 204
  26. 204
  27. 353
  28. 165
  29. 271
  30. 529
  31. 493
  32. 181
  33. 322
  34. 261
  35. 212
  36. 218
  37. 397
  38. 269
  39. 330
  40. 367

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