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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 601 · 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.I thought of a number, added 4 and then doubled it. I got 14. What was my number?
  2. 2.46 × 4 =
  3. 3.Magic square (every row, column and diagonal has the same total): 8 ? 12 | 13 9 5 | 6 11 10. What is the missing number?
  4. 4.61?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.I thought of a number, multiplied it by 2 and added 4. I got 10. What was my number?
  6. 6.Double 83 =
  7. 7.I thought of a number, added 9 and then doubled it. I got 36. What was my number?
  8. 8.9 × 6 = 5? — what is the missing digit?
  9. 9.111 × 111 =
  10. 10.You have 8 coins. Each coin is ₹1 or ₹2, and together they make ₹10. How many ₹2 coins do you have?
  11. 11.In 6 years a boy will be 18 years old. How old was he 3 years ago?
  12. 12.2 × 1000 =
  13. 13.Magic square (every row, column and diagonal has the same total): ? 12 5 | 6 8 10 | 11 4 9. What is the missing number?
  14. 14.9 × 2 =
  15. 15.Magic square (every row, column and diagonal has the same total): ? 10 11 | 8 12 16 | 13 14 9. What is the missing number?
  16. 16.123456 × 8 + 6 =
  17. 17.1?74 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.37 × 3 =
  19. 19.1 + 2 + 3 + … + 31 =
  20. 20.6 × 9 =
  21. 21.Magic trick! Think of 2. Double it, add 8, halve it, then take away 2. What number do you get?
  22. 22.What comes next? 1, 4, 9, 16, ? (a) 25 (b) 26 (c) 23 (d) 27
  23. 23.9 × 2 = ?8 — what is the missing digit?
  24. 24.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 12 (c) 17 (d) 14
  25. 25.2 × 9 =
  26. 26.1234 × 8 + 4 =
  27. 27.1 + 2 + 3 + … + 44 =
  28. 28.63? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.Double 62 =
  30. 30.Magic trick! Think of 7. Double it, add 18, halve it, then take away 7. What number do you get?
  31. 31.A father is 40 years old and his son is 4. How old was the father when the son was born?
  32. 32.9 × 9 =
  33. 33.9 × 10 = 9? — what is the missing digit?
  34. 34.If today is Tuesday, what day was it 33 days ago? (a) Friday (b) Sunday (c) Wednesday (d) Thursday
  35. 35.Half of 158 =
  36. 36.1 + 3 + 5 + … + 37 =
  37. 37.855 × ? = 8550
  38. 38.5 × 9 =
  39. 39.1 + 2 + 3 + … + 51 =
  40. 40.9 × 3 =

Answer key

  1. 3
  2. 184
  3. 7
  4. 2
  5. 3
  6. 166
  7. 9
  8. 4
  9. 12321
  10. 2
  11. 9
  12. 2000
  13. 7
  14. 18
  15. 15
  16. 987654
  17. 6
  18. 111
  19. 496
  20. 54
  21. 4
  22. 25
  23. 1
  24. 16
  25. 18
  26. 9876
  27. 990
  28. 9
  29. 124
  30. 9
  31. 36
  32. 81
  33. 0
  34. Thursday
  35. 79
  36. 361
  37. 10
  38. 45
  39. 1326
  40. 27

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