Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 389 · 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.Double 96 =
2. 2.9 × 1 =
3. 3.Magic trick! Think of 16. Double it, add 10, halve it, then take away 16. What number do you get?
4. 4.5 × 9 =
5. 5.19 × 4 =
6. 6.8 × 4 =
7. 7.123456 × 9 + 7 =
8. 8.49 × 4 =
9. 9.The ages of two twins add up to 10. How old is each twin?
10. 10.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹17. How many ₹2 coins do you have?
11. 11.What comes next? 9, 11, 13, 15, ? (a) 17 (b) 15 (c) 19 (d) 18
12. 12.Double 58 =
13. 13.9 × 9 = 8? — what is the missing digit?
14. 14.?105 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Half of 42 =
16. 16.12 × 9 + 3 =
17. 17.45 × 1000 =
18. 18.Half of 72 =
19. 19.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 51 (c) 50 (d) 49
20. 20.Magic trick! Think of 14. Double it, add 10, halve it, then take away 14. What number do you get?
21. 21.37 × 4 =
22. 22.Magic square (every row, column and diagonal has the same total): 9 7 ? | 19 11 3 | 5 15 13. What is the missing number?
23. 23.37 × 15 =
24. 24.Magic square (every row, column and diagonal has the same total): 23 13 ? | 9 17 25 | 19 21 11. What is the missing number?
25. 25.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
26. 26.9 × 2 =
27. 27.63 × ? = 630
28. 28.A piggy bank has 8 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
29. 29.13 × 4 =
30. 30.Half of 178 =
31. 31.If today is Sunday, what day was it 39 days ago? (a) Tuesday (b) Saturday (c) Thursday (d) Wednesday
32. 32.37 × 18 =
33. 33.Take 801. Reverse its digits and take the smaller number away from the bigger one. What do you get?
34. 34.891 + 198 =
35. 35.658 × 10 =
36. 36.Think of 8. Multiply it by 5, then add 2. What number do you end with?
37. 37.What comes next? 19, 28, 37, 46, ? (a) 64 (b) 56 (c) 55 (d) 46
38. 38.In 3 years a boy will be 15 years old. How old was he 5 years ago?
39. 39.Think of 8. Multiply it by 3, then add 7. What number do you end with?
40. 40.13?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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