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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 775 · 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. 1.240 + 28 =
  2. 2.160 + 97 =
  3. 3.368 + 17 =
  4. 4.344 + 38 =
  5. 5.415 + 97 =
  6. 6.495 + 49 =
  7. 7.62 + 99 =
  8. 8.28 + 99 =
  9. 9.480 + 27 =
  10. 10.75 + 37 =
  11. 11.185 + 28 =
  12. 12.135 + 37 =
  13. 13.152 + 68 =
  14. 14.451 + 37 =
  15. 15.243 + 39 =
  16. 16.64 + 58 =
  17. 17.159 + 19 =
  18. 18.313 + 18 =
  19. 19.85 + 48 =
  20. 20.443 + 79 =
  21. 21.139 + 37 =
  22. 22.342 + 48 =
  23. 23.85 + 19 =
  24. 24.194 + 49 =
  25. 25.222 + 49 =
  26. 26.29 + 68 =
  27. 27.292 + 27 =
  28. 28.335 + 57 =
  29. 29.158 + 48 =
  30. 30.312 + 57 =
  31. 31.446 + 18 =
  32. 32.450 + 47 =
  33. 33.31 + 37 =
  34. 34.390 + 18 =
  35. 35.223 + 17 =
  36. 36.169 + 18 =
  37. 37.131 + 49 =
  38. 38.120 + 48 =
  39. 39.431 + 99 =
  40. 40.402 + 78 =

Answer key

  1. 268
  2. 257
  3. 385
  4. 382
  5. 512
  6. 544
  7. 161
  8. 127
  9. 507
  10. 112
  11. 213
  12. 172
  13. 220
  14. 488
  15. 282
  16. 122
  17. 178
  18. 331
  19. 133
  20. 522
  21. 176
  22. 390
  23. 104
  24. 243
  25. 271
  26. 97
  27. 319
  28. 392
  29. 206
  30. 369
  31. 464
  32. 497
  33. 68
  34. 408
  35. 240
  36. 187
  37. 180
  38. 168
  39. 530
  40. 480

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