Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 809 · 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 square (every row, column and diagonal has the same total): 31 ? 25 | 16 22 28 | 19 34 13. What is the missing number?
2. 2.Double 42 =
3. 3.Do the 1089 trick with 550: reverse and subtract, then reverse that answer and add. What do you get?
4. 4.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
5. 5.Double 83 =
6. 6.Magic square (every row, column and diagonal has the same total): 8 22 12 | 18 14 10 | 16 6 ?. What is the missing number?
7. 7.Take 69 and take away the sum of its digits. What do you get?
8. 8.37 × 6 =
9. 9.23 × 4 =
10. 10.If today is Wednesday, what day was it 51 days ago? (a) Thursday (b) Monday (c) Sunday (d) Tuesday
11. 11.1234567 × 8 + 7 =
12. 12.1 + 2 + 3 + … + 87 =
13. 13.I thought of a number, added 7 and then doubled it. I got 54. What was my number?
14. 14.10 × 100 =
15. 15.74 × ? = 740
16. 16.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹14. How many ₹2 coins do you have?
17. 17.Take 900. Reverse its digits and take the smaller number away from the bigger one. What do you get?
18. 18.390? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.What comes next? 8, 13, 18, 23, ? (a) 33 (b) 29 (c) 23 (d) 28
20. 20.Take 660. Reverse its digits and take the smaller number away from the bigger one. What do you get?
21. 21.9 × 10 =
22. 22.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 25 (c) 27 (d) 23
23. 23.17 × 4 =
24. 24.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹20. How many ₹2 coins do you have?
25. 25.47 × 1000 =
26. 26.1 + 2 + 3 + … + 70 =
27. 27.Magic trick! Think of 20. Double it, add 8, halve it, then take away 20. What number do you get?
28. 28.Double 85 =
29. 29.1 + 3 + 5 + … + 9 =
30. 30.48?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.12 × 9 + 3 =
32. 32.533 × 10 =
33. 33.594 + 495 =
34. 34.10 × 9 =
35. 35.Double 81 =
36. 36.2?13 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.481 × ? = 4810
38. 38.Magic square (every row, column and diagonal has the same total): 10 5 6 | 3 7 ? | 8 9 4. What is the missing number?
39. 39.58 × 4 =
40. 40.19 × 1000 =

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