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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 245 · 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. 1.73 + 88 =
  2. 2.274 + 69 =
  3. 3.374 + 17 =
  4. 4.156 + 28 =
  5. 5.92 + 98 =
  6. 6.398 + 79 =
  7. 7.303 + 59 =
  8. 8.39 + 57 =
  9. 9.71 + 17 =
  10. 10.487 + 58 =
  11. 11.70 + 59 =
  12. 12.85 + 19 =
  13. 13.264 + 68 =
  14. 14.182 + 78 =
  15. 15.422 + 77 =
  16. 16.40 + 99 =
  17. 17.186 + 67 =
  18. 18.48 + 18 =
  19. 19.112 + 68 =
  20. 20.401 + 17 =
  21. 21.438 + 89 =
  22. 22.379 + 28 =
  23. 23.274 + 47 =
  24. 24.53 + 47 =
  25. 25.245 + 39 =
  26. 26.207 + 88 =
  27. 27.26 + 27 =
  28. 28.336 + 59 =
  29. 29.65 + 87 =
  30. 30.40 + 67 =
  31. 31.235 + 27 =
  32. 32.136 + 38 =
  33. 33.208 + 48 =
  34. 34.439 + 78 =
  35. 35.179 + 77 =
  36. 36.283 + 18 =
  37. 37.116 + 97 =
  38. 38.345 + 79 =
  39. 39.193 + 97 =
  40. 40.104 + 67 =

Answer key

  1. 161
  2. 343
  3. 391
  4. 184
  5. 190
  6. 477
  7. 362
  8. 96
  9. 88
  10. 545
  11. 129
  12. 104
  13. 332
  14. 260
  15. 499
  16. 139
  17. 253
  18. 66
  19. 180
  20. 418
  21. 527
  22. 407
  23. 321
  24. 100
  25. 284
  26. 295
  27. 53
  28. 395
  29. 152
  30. 107
  31. 262
  32. 174
  33. 256
  34. 517
  35. 256
  36. 301
  37. 213
  38. 424
  39. 290
  40. 171

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