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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 824 · 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. 1.48 + 68 =
  2. 2.446 + 19 =
  3. 3.469 + 48 =
  4. 4.423 + 48 =
  5. 5.435 + 77 =
  6. 6.30 + 97 =
  7. 7.131 + 47 =
  8. 8.499 + 79 =
  9. 9.404 + 27 =
  10. 10.421 + 37 =
  11. 11.46 + 97 =
  12. 12.329 + 67 =
  13. 13.142 + 18 =
  14. 14.200 + 27 =
  15. 15.225 + 87 =
  16. 16.238 + 19 =
  17. 17.135 + 87 =
  18. 18.467 + 78 =
  19. 19.159 + 68 =
  20. 20.101 + 18 =
  21. 21.158 + 87 =
  22. 22.447 + 57 =
  23. 23.281 + 78 =
  24. 24.318 + 29 =
  25. 25.233 + 37 =
  26. 26.155 + 18 =
  27. 27.71 + 99 =
  28. 28.86 + 68 =
  29. 29.241 + 89 =
  30. 30.251 + 89 =
  31. 31.434 + 27 =
  32. 32.429 + 27 =
  33. 33.169 + 17 =
  34. 34.99 + 37 =
  35. 35.299 + 97 =
  36. 36.156 + 69 =
  37. 37.222 + 39 =
  38. 38.245 + 58 =
  39. 39.343 + 78 =
  40. 40.71 + 27 =

Answer key

  1. 116
  2. 465
  3. 517
  4. 471
  5. 512
  6. 127
  7. 178
  8. 578
  9. 431
  10. 458
  11. 143
  12. 396
  13. 160
  14. 227
  15. 312
  16. 257
  17. 222
  18. 545
  19. 227
  20. 119
  21. 245
  22. 504
  23. 359
  24. 347
  25. 270
  26. 173
  27. 170
  28. 154
  29. 330
  30. 340
  31. 461
  32. 456
  33. 186
  34. 136
  35. 396
  36. 225
  37. 261
  38. 303
  39. 421
  40. 98

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