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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 327 · 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. 1.376 + 88 =
  2. 2.162 + 47 =
  3. 3.167 + 87 =
  4. 4.204 + 18 =
  5. 5.265 + 79 =
  6. 6.252 + 27 =
  7. 7.173 + 78 =
  8. 8.262 + 37 =
  9. 9.445 + 89 =
  10. 10.72 + 58 =
  11. 11.482 + 17 =
  12. 12.34 + 47 =
  13. 13.293 + 67 =
  14. 14.76 + 37 =
  15. 15.49 + 97 =
  16. 16.89 + 77 =
  17. 17.104 + 27 =
  18. 18.31 + 47 =
  19. 19.385 + 49 =
  20. 20.353 + 37 =
  21. 21.495 + 38 =
  22. 22.76 + 59 =
  23. 23.95 + 58 =
  24. 24.156 + 67 =
  25. 25.330 + 79 =
  26. 26.208 + 67 =
  27. 27.96 + 67 =
  28. 28.482 + 88 =
  29. 29.151 + 49 =
  30. 30.48 + 47 =
  31. 31.270 + 57 =
  32. 32.128 + 38 =
  33. 33.162 + 57 =
  34. 34.355 + 87 =
  35. 35.227 + 88 =
  36. 36.355 + 68 =
  37. 37.201 + 68 =
  38. 38.464 + 48 =
  39. 39.192 + 28 =
  40. 40.76 + 27 =

Answer key

  1. 464
  2. 209
  3. 254
  4. 222
  5. 344
  6. 279
  7. 251
  8. 299
  9. 534
  10. 130
  11. 499
  12. 81
  13. 360
  14. 113
  15. 146
  16. 166
  17. 131
  18. 78
  19. 434
  20. 390
  21. 533
  22. 135
  23. 153
  24. 223
  25. 409
  26. 275
  27. 163
  28. 570
  29. 200
  30. 95
  31. 327
  32. 166
  33. 219
  34. 442
  35. 315
  36. 423
  37. 269
  38. 512
  39. 220
  40. 103

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