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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 18 · 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. 1.476 + 38 =
  2. 2.432 + 37 =
  3. 3.141 + 87 =
  4. 4.149 + 89 =
  5. 5.219 + 28 =
  6. 6.166 + 77 =
  7. 7.298 + 79 =
  8. 8.120 + 99 =
  9. 9.31 + 19 =
  10. 10.358 + 29 =
  11. 11.137 + 88 =
  12. 12.189 + 98 =
  13. 13.100 + 49 =
  14. 14.109 + 79 =
  15. 15.292 + 27 =
  16. 16.233 + 89 =
  17. 17.334 + 68 =
  18. 18.243 + 97 =
  19. 19.97 + 39 =
  20. 20.245 + 17 =
  21. 21.132 + 99 =
  22. 22.352 + 78 =
  23. 23.98 + 99 =
  24. 24.77 + 17 =
  25. 25.146 + 67 =
  26. 26.282 + 79 =
  27. 27.308 + 59 =
  28. 28.199 + 39 =
  29. 29.118 + 38 =
  30. 30.149 + 47 =
  31. 31.119 + 18 =
  32. 32.387 + 28 =
  33. 33.495 + 39 =
  34. 34.310 + 99 =
  35. 35.341 + 69 =
  36. 36.49 + 38 =
  37. 37.156 + 29 =
  38. 38.96 + 38 =
  39. 39.193 + 48 =
  40. 40.446 + 77 =

Answer key

  1. 514
  2. 469
  3. 228
  4. 238
  5. 247
  6. 243
  7. 377
  8. 219
  9. 50
  10. 387
  11. 225
  12. 287
  13. 149
  14. 188
  15. 319
  16. 322
  17. 402
  18. 340
  19. 136
  20. 262
  21. 231
  22. 430
  23. 197
  24. 94
  25. 213
  26. 361
  27. 367
  28. 238
  29. 156
  30. 196
  31. 137
  32. 415
  33. 534
  34. 409
  35. 410
  36. 87
  37. 185
  38. 134
  39. 241
  40. 523

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