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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 629 · 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. 1.41 + 48 =
  2. 2.58 + 77 =
  3. 3.220 + 68 =
  4. 4.127 + 28 =
  5. 5.299 + 88 =
  6. 6.416 + 87 =
  7. 7.189 + 19 =
  8. 8.430 + 68 =
  9. 9.125 + 38 =
  10. 10.217 + 78 =
  11. 11.170 + 57 =
  12. 12.76 + 88 =
  13. 13.393 + 37 =
  14. 14.55 + 77 =
  15. 15.224 + 69 =
  16. 16.120 + 57 =
  17. 17.33 + 37 =
  18. 18.89 + 37 =
  19. 19.236 + 98 =
  20. 20.268 + 67 =
  21. 21.331 + 89 =
  22. 22.460 + 37 =
  23. 23.104 + 99 =
  24. 24.128 + 78 =
  25. 25.32 + 18 =
  26. 26.92 + 87 =
  27. 27.73 + 39 =
  28. 28.314 + 48 =
  29. 29.132 + 78 =
  30. 30.355 + 89 =
  31. 31.174 + 37 =
  32. 32.136 + 37 =
  33. 33.437 + 99 =
  34. 34.115 + 89 =
  35. 35.28 + 87 =
  36. 36.340 + 69 =
  37. 37.327 + 37 =
  38. 38.457 + 97 =
  39. 39.234 + 48 =
  40. 40.173 + 87 =

Answer key

  1. 89
  2. 135
  3. 288
  4. 155
  5. 387
  6. 503
  7. 208
  8. 498
  9. 163
  10. 295
  11. 227
  12. 164
  13. 430
  14. 132
  15. 293
  16. 177
  17. 70
  18. 126
  19. 334
  20. 335
  21. 420
  22. 497
  23. 203
  24. 206
  25. 50
  26. 179
  27. 112
  28. 362
  29. 210
  30. 444
  31. 211
  32. 173
  33. 536
  34. 204
  35. 115
  36. 409
  37. 364
  38. 554
  39. 282
  40. 260

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