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Magic Number Patterns Worksheet

Maths tricks trick 9: Magic number patterns · Set 143 · 40 questions
TalentJR

The trick (Spot the pattern): 37 × 3 = 111, so 37 × (3 × k) is k written three times. 12345679 × 9 = 111111111, so 12345679 × (9 × k) is k written nine times. 1 × 8 + 1 = 9, 12 × 8 + 2 = 98, 123 × 8 + 3 = 987 …; and 11 × 11 = 121, 111 × 111 = 12321.

NameDateTime takenScore ___ / 40
  1. 1.123456 × 9 + 7 =
  2. 2.37 × 21 =
  3. 3.123 × 9 + 4 =
  4. 4.12345679 × 45 =
  5. 5.12345679 × 36 =
  6. 6.37 × 27 =
  7. 7.12 × 9 + 3 =
  8. 8.12345678 × 8 + 8 =
  9. 9.123 × 8 + 3 =
  10. 10.37 × 9 =
  11. 11.37 × 3 =
  12. 12.11 × 11 =
  13. 13.11111 × 11111 =
  14. 14.111 × 111 =
  15. 15.12 × 8 + 2 =
  16. 16.1234 × 8 + 4 =
  17. 17.12345679 × 72 =
  18. 18.12345679 × 54 =
  19. 19.12345679 × 9 =
  20. 20.12345679 × 27 =
  21. 21.37 × 12 =
  22. 22.123456 × 8 + 6 =
  23. 23.111111 × 111111 =
  24. 24.37 × 6 =
  25. 25.1234567 × 9 + 8 =
  26. 26.1111 × 1111 =
  27. 27.1234 × 9 + 5 =
  28. 28.123456789 × 8 + 9 =
  29. 29.1234567 × 8 + 7 =
  30. 30.12345679 × 81 =
  31. 31.12345 × 8 + 5 =
  32. 32.12345679 × 63 =
  33. 33.37 × 15 =
  34. 34.12345 × 9 + 6 =
  35. 35.12345678 × 9 + 9 =
  36. 36.12 × 9 + 3 =
  37. 37.37 × 18 =
  38. 38.12345679 × 18 =
  39. 39.1111 × 1111 =
  40. 40.12 × 8 + 2 =

Answer key

  1. 1111111
  2. 777
  3. 1111
  4. 555555555
  5. 444444444
  6. 999
  7. 111
  8. 98765432
  9. 987
  10. 333
  11. 111
  12. 121
  13. 123454321
  14. 12321
  15. 98
  16. 9876
  17. 888888888
  18. 666666666
  19. 111111111
  20. 333333333
  21. 444
  22. 987654
  23. 12345654321
  24. 222
  25. 11111111
  26. 1234321
  27. 11111
  28. 987654321
  29. 9876543
  30. 999999999
  31. 98765
  32. 777777777
  33. 555
  34. 111111
  35. 111111111
  36. 111
  37. 666
  38. 222222222
  39. 1234321
  40. 98

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