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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 760 · 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 + 78 =
  2. 2.367 + 28 =
  3. 3.141 + 18 =
  4. 4.116 + 39 =
  5. 5.225 + 49 =
  6. 6.131 + 27 =
  7. 7.472 + 58 =
  8. 8.364 + 67 =
  9. 9.240 + 17 =
  10. 10.289 + 78 =
  11. 11.221 + 98 =
  12. 12.97 + 69 =
  13. 13.114 + 97 =
  14. 14.282 + 19 =
  15. 15.405 + 78 =
  16. 16.387 + 88 =
  17. 17.223 + 48 =
  18. 18.454 + 87 =
  19. 19.404 + 19 =
  20. 20.216 + 58 =
  21. 21.119 + 97 =
  22. 22.172 + 77 =
  23. 23.33 + 47 =
  24. 24.223 + 89 =
  25. 25.397 + 59 =
  26. 26.262 + 48 =
  27. 27.491 + 29 =
  28. 28.357 + 69 =
  29. 29.195 + 27 =
  30. 30.400 + 19 =
  31. 31.392 + 57 =
  32. 32.318 + 17 =
  33. 33.155 + 19 =
  34. 34.206 + 57 =
  35. 35.31 + 57 =
  36. 36.32 + 39 =
  37. 37.286 + 97 =
  38. 38.114 + 38 =
  39. 39.257 + 39 =
  40. 40.236 + 27 =

Answer key

  1. 340
  2. 395
  3. 159
  4. 155
  5. 274
  6. 158
  7. 530
  8. 431
  9. 257
  10. 367
  11. 319
  12. 166
  13. 211
  14. 301
  15. 483
  16. 475
  17. 271
  18. 541
  19. 423
  20. 274
  21. 216
  22. 249
  23. 80
  24. 312
  25. 456
  26. 310
  27. 520
  28. 426
  29. 222
  30. 419
  31. 449
  32. 335
  33. 174
  34. 263
  35. 88
  36. 71
  37. 383
  38. 152
  39. 296
  40. 263

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