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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 175 · 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. 1.187 + 77 =
  2. 2.386 + 47 =
  3. 3.123 + 38 =
  4. 4.71 + 88 =
  5. 5.112 + 17 =
  6. 6.63 + 29 =
  7. 7.492 + 59 =
  8. 8.178 + 28 =
  9. 9.231 + 37 =
  10. 10.465 + 37 =
  11. 11.75 + 98 =
  12. 12.135 + 87 =
  13. 13.325 + 18 =
  14. 14.241 + 97 =
  15. 15.180 + 68 =
  16. 16.379 + 38 =
  17. 17.235 + 67 =
  18. 18.138 + 98 =
  19. 19.255 + 29 =
  20. 20.241 + 78 =
  21. 21.246 + 47 =
  22. 22.124 + 29 =
  23. 23.131 + 77 =
  24. 24.111 + 29 =
  25. 25.240 + 27 =
  26. 26.283 + 39 =
  27. 27.425 + 87 =
  28. 28.302 + 29 =
  29. 29.436 + 98 =
  30. 30.445 + 79 =
  31. 31.320 + 39 =
  32. 32.35 + 49 =
  33. 33.353 + 17 =
  34. 34.75 + 89 =
  35. 35.160 + 27 =
  36. 36.436 + 57 =
  37. 37.59 + 69 =
  38. 38.409 + 78 =
  39. 39.115 + 18 =
  40. 40.490 + 27 =

Answer key

  1. 264
  2. 433
  3. 161
  4. 159
  5. 129
  6. 92
  7. 551
  8. 206
  9. 268
  10. 502
  11. 173
  12. 222
  13. 343
  14. 338
  15. 248
  16. 417
  17. 302
  18. 236
  19. 284
  20. 319
  21. 293
  22. 153
  23. 208
  24. 140
  25. 267
  26. 322
  27. 512
  28. 331
  29. 534
  30. 524
  31. 359
  32. 84
  33. 370
  34. 164
  35. 187
  36. 493
  37. 128
  38. 487
  39. 133
  40. 517

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