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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 151 · 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. 1.201 + 69 =
  2. 2.27 + 78 =
  3. 3.348 + 28 =
  4. 4.30 + 98 =
  5. 5.41 + 69 =
  6. 6.106 + 99 =
  7. 7.176 + 38 =
  8. 8.254 + 17 =
  9. 9.369 + 98 =
  10. 10.360 + 88 =
  11. 11.119 + 68 =
  12. 12.233 + 89 =
  13. 13.396 + 69 =
  14. 14.120 + 99 =
  15. 15.271 + 47 =
  16. 16.379 + 69 =
  17. 17.241 + 58 =
  18. 18.34 + 47 =
  19. 19.391 + 89 =
  20. 20.275 + 67 =
  21. 21.29 + 77 =
  22. 22.81 + 37 =
  23. 23.499 + 17 =
  24. 24.215 + 77 =
  25. 25.392 + 59 =
  26. 26.468 + 67 =
  27. 27.163 + 87 =
  28. 28.71 + 49 =
  29. 29.105 + 89 =
  30. 30.40 + 49 =
  31. 31.79 + 67 =
  32. 32.199 + 57 =
  33. 33.407 + 39 =
  34. 34.453 + 47 =
  35. 35.267 + 38 =
  36. 36.62 + 38 =
  37. 37.122 + 39 =
  38. 38.41 + 38 =
  39. 39.160 + 47 =
  40. 40.183 + 77 =

Answer key

  1. 270
  2. 105
  3. 376
  4. 128
  5. 110
  6. 205
  7. 214
  8. 271
  9. 467
  10. 448
  11. 187
  12. 322
  13. 465
  14. 219
  15. 318
  16. 448
  17. 299
  18. 81
  19. 480
  20. 342
  21. 106
  22. 118
  23. 516
  24. 292
  25. 451
  26. 535
  27. 250
  28. 120
  29. 194
  30. 89
  31. 146
  32. 256
  33. 446
  34. 500
  35. 305
  36. 100
  37. 161
  38. 79
  39. 207
  40. 260

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