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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 887 · 40 questions
TalentJR

The trick (Choose a trick): × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089. Puzzles: find the rule, the total or the leftover days, then check your answer.

NameDateTime takenScore ___ / 40
  1. 1.Magic square (every row, column and diagonal has the same total): ? 13 8 | 7 11 15 | 14 9 10. What is the missing number?
  2. 2.Think of 8. Multiply it by 5, then add 4. What number do you end with?
  3. 3.9 × 7 = 6? — what is the missing digit?
  4. 4.In 5 years a boy will be 15 years old. How old was he 7 years ago?
  5. 5.Double 51 =
  6. 6.In 2 years a boy will be 10 years old. How old was he 6 years ago?
  7. 7.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 50 (c) 51 (d) 49
  8. 8.Double 55 =
  9. 9.37 × 9 =
  10. 10.796 × 10 =
  11. 11.9 × 8 =
  12. 12.Do the 1089 trick with 894: reverse and subtract, then reverse that answer and add. What do you get?
  13. 13.9 × 4 = 3? — what is the missing digit?
  14. 14.11111 × 11111 =
  15. 15.8 × 4 =
  16. 16.12345678 × 8 + 8 =
  17. 17.24 × 4 =
  18. 18.9 × 7 =
  19. 19.?951 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.What comes next? 9, 17, 25, 33, ? (a) 33 (b) 49 (c) 41 (d) 42
  21. 21.Think of 4. Multiply it by 5, then add 8. What number do you end with?
  22. 22.1 + 2 + 3 + … + 14 =
  23. 23.12 × 8 + 2 =
  24. 24.123456 × 9 + 7 =
  25. 25.Magic square (every row, column and diagonal has the same total): 32 17 20 | 11 23 35 | 26 29 ?. What is the missing number?
  26. 26.4 × 9 =
  27. 27.What comes next? 7, 12, 17, 22, ? (a) 28 (b) 32 (c) 22 (d) 27
  28. 28.792 + 297 =
  29. 29.9 × 8 = 7? — what is the missing digit?
  30. 30.9 × 3 = ?7 — what is the missing digit?
  31. 31.What comes next? 3, 6, 9, 12, ? (a) 16 (b) 18 (c) 12 (d) 15
  32. 32.Magic trick! Think of 3. Double it, add 6, halve it, then take away 3. What number do you get?
  33. 33.Double 27 =
  34. 34.9 × 9 =
  35. 35.35 × 4 =
  36. 36.1 + 3 + 5 + … + 41 =
  37. 37.If today is Wednesday, what day was it 34 days ago? (a) Thursday (b) Sunday (c) Friday (d) Wednesday
  38. 38.34 × 4 =
  39. 39.Do the 1089 trick with 760: reverse and subtract, then reverse that answer and add. What do you get?
  40. 40.1234 × 9 + 5 =

Answer key

  1. 12
  2. 44
  3. 3
  4. 3
  5. 102
  6. 2
  7. 49
  8. 110
  9. 333
  10. 7960
  11. 72
  12. 1089
  13. 6
  14. 123454321
  15. 32
  16. 98765432
  17. 96
  18. 63
  19. 3
  20. 41
  21. 28
  22. 105
  23. 98
  24. 1111111
  25. 14
  26. 36
  27. 27
  28. 1089
  29. 2
  30. 2
  31. 15
  32. 3
  33. 54
  34. 81
  35. 140
  36. 441
  37. Thursday
  38. 136
  39. 1089
  40. 11111

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