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Digital Root Worksheet

Vedic maths trick 12: Digital roots — check any answer · Set 398 · 40 sums
TalentJR

The trick (Gunita Samuccayah): Add the digits of a number; keep adding until one digit is left (a total of 9 stays 9). For a product, multiply the digital roots of the two numbers and take the digital root of that. If your answer’s digital root is different, the answer is wrong.

NameDateTime takenScore ___ / 40
  1. 1.Digital root of 82 × 91 =
  2. 2.Digital root of 43 × 91 =
  3. 3.Digital root of 61 × 52 =
  4. 4.Digital root of 20 × 98 =
  5. 5.Digital root of 34 × 31 =
  6. 6.Digital root of 21085 =
  7. 7.Digital root of 63 × 21 =
  8. 8.Digital root of 51511 =
  9. 9.Digital root of 4415 =
  10. 10.Digital root of 28 × 23 =
  11. 11.Digital root of 36558 =
  12. 12.Digital root of 89 × 45 =
  13. 13.Digital root of 98 × 48 =
  14. 14.Digital root of 25 × 38 =
  15. 15.Digital root of 15 × 89 =
  16. 16.Digital root of 78989 =
  17. 17.Digital root of 5136 =
  18. 18.Digital root of 33 × 40 =
  19. 19.Digital root of 89 × 84 =
  20. 20.Digital root of 29 × 95 =
  21. 21.Digital root of 95 × 80 =
  22. 22.Digital root of 62 × 31 =
  23. 23.Digital root of 42005 =
  24. 24.Digital root of 99 × 37 =
  25. 25.Digital root of 30 × 38 =
  26. 26.Digital root of 7763 =
  27. 27.Digital root of 26 × 49 =
  28. 28.Digital root of 47 × 56 =
  29. 29.Digital root of 28181 =
  30. 30.Digital root of 78821 =
  31. 31.Digital root of 61 × 94 =
  32. 32.Digital root of 29 × 12 =
  33. 33.Digital root of 73051 =
  34. 34.Digital root of 27 × 42 =
  35. 35.Digital root of 70 × 81 =
  36. 36.Digital root of 56327 =
  37. 37.Digital root of 23 × 31 =
  38. 38.Digital root of 22762 =
  39. 39.Digital root of 48511 =
  40. 40.Digital root of 29 × 87 =

Answer key

  1. 1
  2. 7
  3. 4
  4. 7
  5. 1
  6. 7
  7. 9
  8. 4
  9. 5
  10. 5
  11. 9
  12. 9
  13. 6
  14. 5
  15. 3
  16. 5
  17. 6
  18. 6
  19. 6
  20. 1
  21. 4
  22. 5
  23. 2
  24. 9
  25. 6
  26. 5
  27. 5
  28. 4
  29. 2
  30. 8
  31. 1
  32. 6
  33. 7
  34. 9
  35. 9
  36. 5
  37. 2
  38. 1
  39. 1
  40. 3

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