Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 257 · 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 16. Double it, add 8, halve it, then take away 16. What number do you get?
2. 2.34 × 4 =
3. 3.I thought of a number, added 1 and then doubled it. I got 18. What was my number?
4. 4.Magic square (every row, column and diagonal has the same total): 13 15 ? | 3 11 19 | 17 7 9. What is the missing number?
5. 5.1 × 9 =
6. 6.9 × 10 =
7. 7.Half of 26 =
8. 8.What comes next? 1, 6, 11, 16, ? (a) 16 (b) 21 (c) 22 (d) 26
9. 9.Take 40 and take away the sum of its digits. What do you get?
10. 10.9 × 1 =
11. 11.1 + 2 + 3 + … + 18 =
12. 12.9 × 6 =
13. 13.Magic square (every row, column and diagonal has the same total): 19 ? 25 | 22 16 10 | 7 28 13. What is the missing number?
14. 14.40 × 4 =
15. 15.If today is Friday, what day will it be after 24 days? (a) Tuesday (b) Monday (c) Sunday (d) Thursday
16. 16.11 × 11 =
17. 17.10 × 4 =
18. 18.Do the 1089 trick with 952: reverse and subtract, then reverse that answer and add. What do you get?
19. 19.1 + 2 + 3 + … + 9 =
20. 20.85 × 100 =
21. 21.I thought of a number, multiplied it by 2 and added 8. I got 24. What was my number?
22. 22.35 × 1000 =
23. 23.Magic trick! Think of 18. Double it, add 14, halve it, then take away 18. What number do you get?
24. 24.53 × 4 =
25. 25.In 4 years a boy will be 18 years old. How old was he 5 years ago?
26. 26.Magic square (every row, column and diagonal has the same total): 3 ? 7 | 10 6 2 | 5 4 9. What is the missing number?
27. 27.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 81 (c) 83 (d) 79
28. 28.Magic square (every row, column and diagonal has the same total): 19 5 15 | 9 13 17 | 11 21 ?. What is the missing number?
29. 29.1 + 3 + 5 + … + 43 =
30. 30.?077 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.Take 820. Reverse its digits and take the smaller number away from the bigger one. What do you get?
32. 32.Take 47 and take away the sum of its digits. What do you get?
33. 33.2?68 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.12345679 × 72 =
35. 35.Magic trick! Think of 10. Double it, add 16, halve it, then take away 10. What number do you get?
36. 36.A piggy bank has 3 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
37. 37.45 × ? = 45000
38. 38.4 × 9 =
39. 39.Magic square (every row, column and diagonal has the same total): ? 6 16 | 18 10 2 | 4 14 12. What is the missing number?
40. 40.1 + 3 + 5 + … + 41 =

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