Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 22 · 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.Take 16 and take away the sum of its digits. What do you get?
2. 2.Magic trick! Think of 10. Double it, add 10, halve it, then take away 10. What number do you get?
3. 3.12345679 × 27 =
4. 4.I thought of a number, added 3 and then doubled it. I got 14. What was my number?
5. 5.In 4 years a boy will be 17 years old. How old was he 6 years ago?
6. 6.1111 × 1111 =
7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
8. 8.9 × 4 = 3? — what is the missing digit?
9. 9.What comes next? 3, 6, 12, 24, ? (a) 48 (b) 42 (c) 49 (d) 36
10. 10.9 × 7 =
11. 11.I thought of a number, multiplied it by 4 and added 7. I got 67. What was my number?
12. 12.Magic square (every row, column and diagonal has the same total): 13 8 15 | 14 12 10 | 9 16 ?. What is the missing number?
13. 13.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
14. 14.If today is Wednesday, what day was it 40 days ago? (a) Thursday (b) Monday (c) Friday (d) Saturday
15. 15.9 × 10 = 9? — what is the missing digit?
16. 16.33 × 4 =
17. 17.1 + 2 + 3 + … + 22 =
18. 18.13 × 4 =
19. 19.I thought of a number, added 6 and then doubled it. I got 22. What was my number?
20. 20.12 × 1000 =
21. 21.The ages of two twins add up to 26. How old is each twin?
22. 22.Double 51 =
23. 23.12345679 × 9 =
24. 24.I thought of a number, added 1 and then doubled it. I got 14. What was my number?
25. 25.Do the 1089 trick with 722: reverse and subtract, then reverse that answer and add. What do you get?
26. 26.56 × 4 =
27. 27.I thought of a number, multiplied it by 5 and added 5. I got 75. What was my number?
28. 28.Magic square (every row, column and diagonal has the same total): 8 3 ? | 9 7 5 | 4 11 6. What is the missing number?
29. 29.6 × 1000 =
30. 30.I thought of a number, multiplied it by 5 and added 7. I got 67. What was my number?
31. 31.Double 12 =
32. 32.1 + 2 + 3 + … + 45 =
33. 33.1234567 × 9 + 8 =
34. 34.Double 25 =
35. 35.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
36. 36.Double 21 =
37. 37.Half of 104 =
38. 38.The ages of two twins add up to 10. How old is each twin?
39. 39.Do the 1089 trick with 290: reverse and subtract, then reverse that answer and add. What do you get?
40. 40.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹10. How many ₹2 coins do you have?

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