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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 609 · 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 trick! Think of 2. Double it, add 8, halve it, then take away 2. What number do you get?
  2. 2.216 × ? = 2160
  3. 3.Think of 9. Multiply it by 2, then add 2. What number do you end with?
  4. 4.Half of 152 =
  5. 5.8 × 4 =
  6. 6.Magic square (every row, column and diagonal has the same total): 11 6 13 | 12 ? 8 | 7 14 9. What is the missing number?
  7. 7.1 + 2 + 3 + … + 74 =
  8. 8.1 + 2 + 3 + … + 83 =
  9. 9.32 × 4 =
  10. 10.9 × 8 = 7? — what is the missing digit?
  11. 11.Double 12 =
  12. 12.16 × 4 =
  13. 13.12345679 × 81 =
  14. 14.33 × 4 =
  15. 15.9 × 5 = ?5 — what is the missing digit?
  16. 16.1 + 2 + 3 + … + 98 =
  17. 17.220? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.You have 8 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  19. 19.9 × 4 = ?6 — what is the missing digit?
  20. 20.28 × 100 =
  21. 21.1 + 3 + 5 + … + 35 =
  22. 22.Double 48 =
  23. 23.If today is Monday, what day was it 23 days ago? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
  24. 24.9 × 6 =
  25. 25.48 × ? = 48000
  26. 26.Think of 12. Multiply it by 2, then add 2. What number do you end with?
  27. 27.Double 87 =
  28. 28.1 + 3 + 5 + … + 29 =
  29. 29.30 × 4 =
  30. 30.The 1st of a month is a Saturday. What day is the 29th of the same month? (a) Tuesday (b) Friday (c) Saturday (d) Sunday
  31. 31.9 × 3 = ?7 — what is the missing digit?
  32. 32.Magic square (every row, column and diagonal has the same total): 21 36 15 | 18 24 30 | ? 12 27. What is the missing number?
  33. 33.33?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.12345679 × 63 =
  35. 35.In 5 years a boy will be 16 years old. How old was he 2 years ago?
  36. 36.1?21 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.49 × 100 =
  38. 38.1 + 2 + 3 + … + 50 =
  39. 39.Magic square (every row, column and diagonal has the same total): 9 16 11 | 14 ? 10 | 13 8 15. What is the missing number?
  40. 40.1234567 × 9 + 8 =

Answer key

  1. 4
  2. 10
  3. 20
  4. 76
  5. 32
  6. 10
  7. 2775
  8. 3486
  9. 128
  10. 2
  11. 24
  12. 64
  13. 999999999
  14. 132
  15. 4
  16. 4851
  17. 5
  18. 5
  19. 3
  20. 2800
  21. 324
  22. 96
  23. Saturday
  24. 54
  25. 1000
  26. 26
  27. 174
  28. 225
  29. 120
  30. Saturday
  31. 2
  32. 33
  33. 7
  34. 777777777
  35. 9
  36. 5
  37. 4900
  38. 1275
  39. 12
  40. 11111111

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