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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 716 · 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. 1.83 + 17 =
  2. 2.273 + 88 =
  3. 3.194 + 69 =
  4. 4.32 + 78 =
  5. 5.167 + 87 =
  6. 6.304 + 17 =
  7. 7.480 + 59 =
  8. 8.374 + 57 =
  9. 9.47 + 59 =
  10. 10.255 + 18 =
  11. 11.428 + 38 =
  12. 12.396 + 67 =
  13. 13.34 + 79 =
  14. 14.331 + 99 =
  15. 15.307 + 27 =
  16. 16.49 + 37 =
  17. 17.445 + 19 =
  18. 18.335 + 27 =
  19. 19.31 + 48 =
  20. 20.77 + 19 =
  21. 21.219 + 37 =
  22. 22.340 + 19 =
  23. 23.302 + 28 =
  24. 24.282 + 58 =
  25. 25.161 + 59 =
  26. 26.241 + 99 =
  27. 27.134 + 77 =
  28. 28.164 + 19 =
  29. 29.462 + 59 =
  30. 30.452 + 18 =
  31. 31.235 + 39 =
  32. 32.240 + 67 =
  33. 33.407 + 59 =
  34. 34.307 + 57 =
  35. 35.391 + 38 =
  36. 36.81 + 29 =
  37. 37.436 + 17 =
  38. 38.333 + 87 =
  39. 39.313 + 29 =
  40. 40.488 + 37 =

Answer key

  1. 100
  2. 361
  3. 263
  4. 110
  5. 254
  6. 321
  7. 539
  8. 431
  9. 106
  10. 273
  11. 466
  12. 463
  13. 113
  14. 430
  15. 334
  16. 86
  17. 464
  18. 362
  19. 79
  20. 96
  21. 256
  22. 359
  23. 330
  24. 340
  25. 220
  26. 340
  27. 211
  28. 183
  29. 521
  30. 470
  31. 274
  32. 307
  33. 466
  34. 364
  35. 429
  36. 110
  37. 453
  38. 420
  39. 342
  40. 525

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