Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 929 · 40 questions

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.

1. 1.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
2. 2.9 × 10 = 9? — what is the missing digit?
3. 3.9 × 6 = 5? — what is the missing digit?
4. 4.Double 77 =
5. 5.I thought of a number, multiplied it by 3 and added 5. I got 23. What was my number?
6. 6.A girl is 8 years old and her brother is 6 years older. How old will her brother be in 9 years?
7. 7.Magic trick! Think of 6. Double it, add 6, halve it, then take away 6. What number do you get?
8. 8.I thought of a number, added 6 and then doubled it. I got 42. What was my number?
9. 9.Magic square (every row, column and diagonal has the same total): ? 20 10 | 8 16 24 | 22 12 14. What is the missing number?
10. 10.?284 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.15 × 10 =
12. 12.I thought of a number, added 6 and then doubled it. I got 48. What was my number?
13. 13.In 3 years a boy will be 16 years old. How old was he 2 years ago?
14. 14.33 × 4 =
15. 15.9 × 5 =
16. 16.Magic trick! Think of 17. Double it, add 18, halve it, then take away 17. What number do you get?
17. 17.84 × 100 =
18. 18.9 × 2 = ?8 — what is the missing digit?
19. 19.9 × 4 = ?6 — what is the missing digit?
20. 20.69 × ? = 6900
21. 21.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 70 (c) 60 (d) 80
22. 22.9 × 3 = ?7 — what is the missing digit?
23. 23.1 + 2 + 3 + … + 26 =
24. 24.9 × 2 =
25. 25.Take 90 and take away the sum of its digits. What do you get?
26. 26.1 + 2 + 3 + … + 36 =
27. 27.42 × 4 =
28. 28.8 × 9 =
29. 29.Take 230. Reverse its digits and take the smaller number away from the bigger one. What do you get?
30. 30.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 32 (c) 28 (d) 24
31. 31.I thought of a number, multiplied it by 3 and added 1. I got 16. What was my number?
32. 32.What comes next? 3, 6, 12, 24, ? (a) 42 (b) 48 (c) 36 (d) 49
33. 33.12 × 9 + 3 =
34. 34.9 × 2 = 1? — what is the missing digit?
35. 35.I thought of a number, multiplied it by 5 and added 7. I got 62. What was my number?
36. 36.Take 25 and take away the sum of its digits. What do you get?
37. 37.The ages of two twins add up to 12. How old is each twin?
38. 38.9 × 4 =
39. 39.Take 33 and take away the sum of its digits. What do you get?
40. 40.46 × 4 =

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