Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 913 · 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 7. Double it, add 6, halve it, then take away 7. What number do you get?
2. 2.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹29. How many ₹2 coins do you have?
3. 3.7 × 9 =
4. 4.I thought of a number, multiplied it by 3 and added 5. I got 47. What was my number?
5. 5.56 × 4 =
6. 6.16 × 100 =
7. 7.Magic trick! Think of 9. Double it, add 12, halve it, then take away 9. What number do you get?
8. 8.9 × 6 = 5? — what is the missing digit?
9. 9.Double 14 =
10. 10.Take 22 and take away the sum of its digits. What do you get?
11. 11.Magic square (every row, column and diagonal has the same total): 14 15 10 | 9 13 17 | ? 11 12. What is the missing number?
12. 12.Magic trick! Think of 8. Double it, add 4, halve it, then take away 8. What number do you get?
13. 13.37 × 9 =
14. 14.What comes next? 4, 9, 16, 25, ? (a) 38 (b) 37 (c) 34 (d) 36
15. 15.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 16 (c) 12 (d) 14
16. 16.1 + 2 + 3 + … + 26 =
17. 17.1 + 3 + 5 + … + 37 =
18. 18.Double 21 =
19. 19.Double 98 =
20. 20.9 × 9 = 8? — what is the missing digit?
21. 21.1 + 2 + 3 + … + 87 =
22. 22.Take 71 and take away the sum of its digits. What do you get?
23. 23.Double 62 =
24. 24.Odd one out: which number is NOT in the 5 times table? (a) 20 (b) 18 (c) 30 (d) 45
25. 25.Magic square (every row, column and diagonal has the same total): 7 12 11 | 14 ? 6 | 9 8 13. What is the missing number?
26. 26.126 × 10 =
27. 27.6 × 9 =
28. 28.9 × 1 =
29. 29.9 × 4 = ?6 — what is the missing digit?
30. 30.If today is Thursday, what day will it be after 97 days? (a) Thursday (b) Tuesday (c) Saturday (d) Wednesday
31. 31.696 × 10 =
32. 32.14 × 4 =
33. 33.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 60 (c) 81 (d) 70
34. 34.9 × 9 =
35. 35.87 × 100 =
36. 36.Magic trick! Think of 7. Double it, add 4, halve it, then take away 7. What number do you get?
37. 37.?519 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.If today is Saturday, what day was it 19 days ago? (a) Monday (b) Thursday (c) Tuesday (d) Sunday
39. 39.30 × 4 =
40. 40.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?

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