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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 615 · 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. 1.190 + 28 =
  2. 2.41 + 37 =
  3. 3.165 + 19 =
  4. 4.184 + 47 =
  5. 5.50 + 27 =
  6. 6.329 + 78 =
  7. 7.264 + 98 =
  8. 8.81 + 17 =
  9. 9.127 + 47 =
  10. 10.83 + 87 =
  11. 11.237 + 99 =
  12. 12.235 + 89 =
  13. 13.305 + 49 =
  14. 14.203 + 77 =
  15. 15.73 + 28 =
  16. 16.277 + 58 =
  17. 17.344 + 29 =
  18. 18.499 + 57 =
  19. 19.340 + 18 =
  20. 20.420 + 48 =
  21. 21.361 + 67 =
  22. 22.423 + 97 =
  23. 23.71 + 17 =
  24. 24.397 + 87 =
  25. 25.124 + 47 =
  26. 26.123 + 37 =
  27. 27.225 + 68 =
  28. 28.156 + 77 =
  29. 29.487 + 17 =
  30. 30.269 + 89 =
  31. 31.365 + 17 =
  32. 32.308 + 27 =
  33. 33.119 + 58 =
  34. 34.179 + 17 =
  35. 35.30 + 37 =
  36. 36.164 + 17 =
  37. 37.254 + 28 =
  38. 38.370 + 28 =
  39. 39.263 + 79 =
  40. 40.110 + 29 =

Answer key

  1. 218
  2. 78
  3. 184
  4. 231
  5. 77
  6. 407
  7. 362
  8. 98
  9. 174
  10. 170
  11. 336
  12. 324
  13. 354
  14. 280
  15. 101
  16. 335
  17. 373
  18. 556
  19. 358
  20. 468
  21. 428
  22. 520
  23. 88
  24. 484
  25. 171
  26. 160
  27. 293
  28. 233
  29. 504
  30. 358
  31. 382
  32. 335
  33. 177
  34. 196
  35. 67
  36. 181
  37. 282
  38. 398
  39. 342
  40. 139

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