Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 11 · 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. 1.320 × ? = 3200
2. 2.12345679 × 27 =
3. 3.9 × 4 = ?6 — what is the missing digit?
4. 4.Magic trick! Think of 2. Double it, add 10, halve it, then take away 2. What number do you get?
5. 5.6 × 9 =
6. 6.Magic square (every row, column and diagonal has the same total): 9 ? 21 | 30 18 6 | 15 12 27. What is the missing number?
7. 7.945 × ? = 9450
8. 8.If today is Tuesday, what day was it 42 days ago? (a) Monday (b) Tuesday (c) Wednesday (d) Friday
9. 9.4 × 9 =
10. 10.7 × 9 =
11. 11.Magic square (every row, column and diagonal has the same total): 10 ? 12 | 15 13 11 | 14 9 16. What is the missing number?
12. 12.Double 92 =
13. 13.9 × 9 =
14. 14.Do the 1089 trick with 801: reverse and subtract, then reverse that answer and add. What do you get?
15. 15.42 × 10 =
16. 16.123 × 8 + 3 =
17. 17.Magic square (every row, column and diagonal has the same total): ? 8 22 | 20 16 12 | 10 24 14. What is the missing number?
18. 18.Magic square (every row, column and diagonal has the same total): 10 5 6 | 3 7 ? | 8 9 4. What is the missing number?
19. 19.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹17. How many ₹2 coins do you have?
20. 20.1234 × 8 + 4 =
21. 21.9 × 5 = ?5 — what is the missing digit?
22. 22.A girl is 12 years old and her brother is 5 years older. How old will her brother be in 5 years?
23. 23.87?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.21 × 4 =
25. 25.60?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.Take 36 and take away the sum of its digits. What do you get?
27. 27.What comes next? 1, 4, 9, 16, ? (a) 23 (b) 25 (c) 26 (d) 27
28. 28.Take 641. Reverse its digits and take the smaller number away from the bigger one. What do you get?
29. 29.324 × 10 =
30. 30.If today is Sunday, what day was it 8 days ago? (a) Saturday (b) Tuesday (c) Friday (d) Sunday
31. 31.What comes next? 4, 9, 16, 25, ? (a) 36 (b) 34 (c) 37 (d) 38
32. 32.Do the 1089 trick with 866: reverse and subtract, then reverse that answer and add. What do you get?
33. 33.In 3 years a boy will be 14 years old. How old was he 6 years ago?
34. 34.55 × 4 =
35. 35.9 × 3 = 2? — what is the missing digit?
36. 36.792 + 297 =
37. 37.Magic square (every row, column and diagonal has the same total): 12 7 8 | 5 9 13 | 10 ? 6. What is the missing number?
38. 38.Double 49 =
39. 39.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹19. How many ₹2 coins do you have?
40. 40.I thought of a number, multiplied it by 2 and added 7. I got 11. What was my number?

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