Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 658 · 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. 1.55 × 4 =
2. 2.9 × 9 =
3. 3.I thought of a number, added 4 and then doubled it. I got 30. What was my number?
4. 4.Magic square (every row, column and diagonal has the same total): ? 12 7 | 10 8 6 | 9 4 11. What is the missing number?
5. 5.9 × 2 = ?8 — what is the missing digit?
6. 6.9 × 4 = ?6 — what is the missing digit?
7. 7.9 × 8 = 7? — what is the missing digit?
8. 8.7 × 9 =
9. 9.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹7. How many ₹2 coins do you have?
10. 10.291 × ? = 2910
11. 11.891 + 198 =
12. 12.The ages of two twins add up to 8. How old is each twin?
13. 13.I thought of a number, added 5 and then doubled it. I got 42. What was my number?
14. 14.91 × ? = 9100
15. 15.Half of 162 =
16. 16.Double 62 =
17. 17.Magic square (every row, column and diagonal has the same total): ? 9 14 | 15 11 7 | 8 13 12. What is the missing number?
18. 18.Take 16 and take away the sum of its digits. What do you get?
19. 19.539 × 10 =
20. 20.1 + 2 + 3 + … + 38 =
21. 21.1 + 3 + 5 + … + 29 =
22. 22.12345679 × 36 =
23. 23.Magic trick! Think of 8. Double it, add 8, halve it, then take away 8. What number do you get?
24. 24.53 × 100 =
25. 25.Magic square (every row, column and diagonal has the same total): 19 ? 13 | 16 22 28 | 31 10 25. What is the missing number?
26. 26.I thought of a number, multiplied it by 4 and added 3. I got 19. What was my number?
27. 27.1 × 9 =
28. 28.23 × 100 =
29. 29.Magic square (every row, column and diagonal has the same total): 10 17 12 | ? 13 11 | 14 9 16. What is the missing number?
30. 30.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
31. 31.9 × 9 = 8? — what is the missing digit?
32. 32.Half of 12 =
33. 33.If today is Saturday, what day will it be after 66 days? (a) Monday (b) Friday (c) Wednesday (d) Tuesday
34. 34.3 × 9 =
35. 35.Half of 98 =
36. 36.A girl is 5 years old and her brother is 5 years older. How old will her brother be in 2 years?
37. 37.9 × 6 = ?4 — what is the missing digit?
38. 38.59 × 4 =
39. 39.265 × 10 =
40. 40.Take 84 and take away the sum of its digits. What do you get?

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