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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 758 · 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. 1.262 + 47 =
  2. 2.246 + 69 =
  3. 3.169 + 59 =
  4. 4.223 + 89 =
  5. 5.228 + 38 =
  6. 6.151 + 78 =
  7. 7.466 + 19 =
  8. 8.410 + 29 =
  9. 9.295 + 18 =
  10. 10.34 + 57 =
  11. 11.139 + 78 =
  12. 12.434 + 69 =
  13. 13.349 + 97 =
  14. 14.427 + 77 =
  15. 15.82 + 97 =
  16. 16.193 + 39 =
  17. 17.327 + 58 =
  18. 18.25 + 77 =
  19. 19.229 + 18 =
  20. 20.314 + 29 =
  21. 21.397 + 57 =
  22. 22.38 + 87 =
  23. 23.187 + 87 =
  24. 24.27 + 57 =
  25. 25.43 + 87 =
  26. 26.392 + 59 =
  27. 27.381 + 78 =
  28. 28.353 + 87 =
  29. 29.33 + 79 =
  30. 30.166 + 19 =
  31. 31.186 + 48 =
  32. 32.34 + 19 =
  33. 33.452 + 28 =
  34. 34.217 + 78 =
  35. 35.425 + 29 =
  36. 36.299 + 97 =
  37. 37.287 + 58 =
  38. 38.407 + 97 =
  39. 39.217 + 67 =
  40. 40.261 + 67 =

Answer key

  1. 309
  2. 315
  3. 228
  4. 312
  5. 266
  6. 229
  7. 485
  8. 439
  9. 313
  10. 91
  11. 217
  12. 503
  13. 446
  14. 504
  15. 179
  16. 232
  17. 385
  18. 102
  19. 247
  20. 343
  21. 454
  22. 125
  23. 274
  24. 84
  25. 130
  26. 451
  27. 459
  28. 440
  29. 112
  30. 185
  31. 234
  32. 53
  33. 480
  34. 295
  35. 454
  36. 396
  37. 345
  38. 504
  39. 284
  40. 328

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