Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 185 · 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. 1.9 × 9 = 8? — what is the missing digit?
2. 2.Double 74 =
3. 3.A piggy bank has 6 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
4. 4.Half of 94 =
5. 5.Half of 34 =
6. 6.12345679 × 45 =
7. 7.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹20. How many ₹2 coins do you have?
8. 8.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
9. 9.13 × 4 =
10. 10.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 60 (c) 81 (d) 80
11. 11.I thought of a number, added 8 and then doubled it. I got 22. What was my number?
12. 12.Magic square (every row, column and diagonal has the same total): 11 18 13 | 16 ? 12 | 15 10 17. What is the missing number?
13. 13.46 × 100 =
14. 14.33 × 4 =
15. 15.11111 × 11111 =
16. 16.Half of 142 =
17. 17.231 × ? = 2310
18. 18.53 × 100 =
19. 19.Magic square (every row, column and diagonal has the same total): 24 9 30 | 27 21 15 | ? 33 18. What is the missing number?
20. 20.In 5 years a boy will be 18 years old. How old was he 2 years ago?
21. 21.1 + 3 + 5 + … + 13 =
22. 22.Do the 1089 trick with 931: reverse and subtract, then reverse that answer and add. What do you get?
23. 23.The ages of two twins add up to 18. How old is each twin?
24. 24.9 × 2 = ?8 — what is the missing digit?
25. 25.9 × 8 = 7? — what is the missing digit?
26. 26.If today is Sunday, what day was it 56 days ago? (a) Monday (b) Saturday (c) Sunday (d) Wednesday
27. 27.31 × 4 =
28. 28.1111 × 1111 =
29. 29.6 × 9 =
30. 30.16 × 4 =
31. 31.9 × 3 = ?7 — what is the missing digit?
32. 32.Double 19 =
33. 33.12 × 9 + 3 =
34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
35. 35.Take 947. Reverse its digits and take the smaller number away from the bigger one. What do you get?
36. 36.Magic square (every row, column and diagonal has the same total): 17 10 15 | ? 14 16 | 13 18 11. What is the missing number?
37. 37.What comes next? 4, 12, 20, 28, ? (a) 44 (b) 36 (c) 37 (d) 28
38. 38.A father is 36 years old and his son is 6. How old was the father when the son was born?
39. 39.3?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.56 × 4 =

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