Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 467 · 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. 1.42 × 4 =
2. 2.9 × 9 =
3. 3.What comes next? 14, 22, 30, 38, ? (a) 54 (b) 46 (c) 47 (d) 38
4. 4.Take 28 and take away the sum of its digits. What do you get?
5. 5.2 × 9 =
6. 6.123 × 9 + 4 =
7. 7.15 × 4 =
8. 8.207 × ? = 2070
9. 9.Think of 9. Multiply it by 4, then add 7. What number do you end with?
10. 10.111 × 111 =
11. 11.9 × 4 =
12. 12.Magic square (every row, column and diagonal has the same total): 6 ? 14 | 20 12 4 | 10 8 18. What is the missing number?
13. 13.Half of 152 =
14. 14.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹15. How many ₹2 coins do you have?
15. 15.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹9. How many ₹2 coins do you have?
16. 16.12 × 8 + 2 =
17. 17.9 × 5 = 4? — what is the missing digit?
18. 18.Magic trick! Think of 7. Double it, add 14, halve it, then take away 7. What number do you get?
19. 19.12345678 × 9 + 9 =
20. 20.Take 76 and take away the sum of its digits. What do you get?
21. 21.If today is Tuesday, what day was it 47 days ago? (a) Sunday (b) Thursday (c) Friday (d) Wednesday
22. 22.5 × ? = 5000
23. 23.Take 990. Reverse its digits and take the smaller number away from the bigger one. What do you get?
24. 24.Magic trick! Think of 3. Double it, add 8, halve it, then take away 3. What number do you get?
25. 25.Magic square (every row, column and diagonal has the same total): 9 19 5 | 7 11 ? | 17 3 13. What is the missing number?
26. 26.7 × 9 =
27. 27.Magic square (every row, column and diagonal has the same total): 14 11 ? | 29 17 5 | 8 23 20. What is the missing number?
28. 28.44 × 100 =
29. 29.?074 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.Think of 7. Multiply it by 5, then add 5. What number do you end with?
31. 31.1 + 2 + 3 + … + 77 =
32. 32.1 + 3 + 5 + … + 41 =
33. 33.4 × 9 =
34. 34.12345679 × 9 =
35. 35.66 × 100 =
36. 36.764? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.31 × 1000 =
38. 38.If today is Sunday, what day was it 56 days ago? (a) Sunday (b) Monday (c) Saturday (d) Wednesday
39. 39.What comes next? 1, 4, 9, 16, ? (a) 23 (b) 26 (c) 27 (d) 25
40. 40.Double 85 =

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