Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 443 · 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.Magic trick! Think of 11. Double it, add 8, halve it, then take away 11. What number do you get?
2. 2.9 × 9 = 8? — what is the missing digit?
3. 3.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹23. How many ₹2 coins do you have?
4. 4.1 + 3 + 5 + … + 21 =
5. 5.49 × 4 =
6. 6.12345679 × 63 =
7. 7.Take 21 and take away the sum of its digits. What do you get?
8. 8.Double 79 =
9. 9.Odd one out: which number is NOT in the 7 times table? (a) 42 (b) 21 (c) 55 (d) 14
10. 10.You have 8 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
11. 11.25 × 4 =
12. 12.40 × 4 =
13. 13.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹8. How many ₹2 coins do you have?
14. 14.Do the 1089 trick with 842: reverse and subtract, then reverse that answer and add. What do you get?
15. 15.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
16. 16.9 × 2 = ?8 — what is the missing digit?
17. 17.123 × 9 + 4 =
18. 18.Half of 72 =
19. 19.Double 72 =
20. 20.2 × 9 =
21. 21.Magic trick! Think of 8. Double it, add 12, halve it, then take away 8. What number do you get?
22. 22.Magic square (every row, column and diagonal has the same total): 18 8 22 | ? 16 12 | 10 24 14. What is the missing number?
23. 23.9 × 2 =
24. 24.Magic square (every row, column and diagonal has the same total): 9 14 13 | 16 12 8 | 11 10 ?. What is the missing number?
25. 25.Half of 126 =
26. 26.I thought of a number, multiplied it by 2 and added 8. I got 32. What was my number?
27. 27.9 × 5 = ?5 — what is the missing digit?
28. 28.9 × 8 = ?2 — what is the missing digit?
29. 29.Take 240. Reverse its digits and take the smaller number away from the bigger one. What do you get?
30. 30.Magic trick! Think of 4. Double it, add 4, halve it, then take away 4. What number do you get?
31. 31.Take 23 and take away the sum of its digits. What do you get?
32. 32.Magic square (every row, column and diagonal has the same total): 16 6 20 | 18 14 10 | 8 22 ?. What is the missing number?
33. 33.60 × 4 =
34. 34.1 + 2 + 3 + … + 36 =
35. 35.84 × ? = 840
36. 36.If today is Tuesday, what day will it be after 18 days? (a) Saturday (b) Tuesday (c) Sunday (d) Friday
37. 37.33 × 4 =
38. 38.35 × ? = 350
39. 39.What comes next? 20, 24, 28, 32, ? (a) 32 (b) 37 (c) 40 (d) 36
40. 40.If today is Thursday, what day was it 42 days ago? (a) Wednesday (b) Friday (c) Sunday (d) Thursday

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