Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 89 · 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. 1.11 × ? = 110
2. 2.12 × 8 + 2 =
3. 3.A father is 36 years old and his son is 8. How old was the father when the son was born?
4. 4.I thought of a number, multiplied it by 4 and added 6. I got 18. What was my number?
5. 5.I thought of a number, multiplied it by 2 and added 3. I got 31. What was my number?
6. 6.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
7. 7.Magic square (every row, column and diagonal has the same total): 12 17 10 | 11 13 ? | 16 9 14. What is the missing number?
8. 8.Magic square (every row, column and diagonal has the same total): 21 6 27 | 24 ? 12 | 9 30 15. What is the missing number?
9. 9.If today is Wednesday, what day was it 30 days ago? (a) Thursday (b) Monday (c) Tuesday (d) Sunday
10. 10.Magic trick! Think of 4. Double it, add 14, halve it, then take away 4. What number do you get?
11. 11.37 × 15 =
12. 12.807? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.A father is 42 years old and his son is 8. How old was the father when the son was born?
14. 14.Magic square (every row, column and diagonal has the same total): 27 6 ? | 12 18 24 | 15 30 9. What is the missing number?
15. 15.Think of 8. Multiply it by 3, then add 1. What number do you end with?
16. 16.9 × 6 = ?4 — what is the missing digit?
17. 17.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 81 (c) 79 (d) 83
18. 18.Think of 4. Multiply it by 5, then add 4. What number do you end with?
19. 19.742 × 10 =
20. 20.9 × 6 = 5? — what is the missing digit?
21. 21.Do the 1089 trick with 670: reverse and subtract, then reverse that answer and add. What do you get?
22. 22.What comes next? 4, 9, 16, 25, ? (a) 37 (b) 38 (c) 34 (d) 36
23. 23.Magic square (every row, column and diagonal has the same total): ? 10 15 | 16 12 8 | 9 14 13. What is the missing number?
24. 24.Magic square (every row, column and diagonal has the same total): 2 ? 6 | 9 5 1 | 4 3 8. What is the missing number?
25. 25.776 × ? = 7760
26. 26.1?17 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
27. 27.9 × 3 = ?7 — what is the missing digit?
28. 28.Do the 1089 trick with 580: reverse and subtract, then reverse that answer and add. What do you get?
29. 29.Take 93 and take away the sum of its digits. What do you get?
30. 30.Take 940. Reverse its digits and take the smaller number away from the bigger one. What do you get?
31. 31.1234567 × 9 + 8 =
32. 32.1 + 3 + 5 + … + 23 =
33. 33.The ages of two twins add up to 24. How old is each twin?
34. 34.Magic trick! Think of 9. Double it, add 10, halve it, then take away 9. What number do you get?
35. 35.3 × 100 =
36. 36.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
37. 37.25 × 4 =
38. 38.13 × 4 =
39. 39.548 × 10 =
40. 40.Magic square (every row, column and diagonal has the same total): 18 15 30 | ? 21 9 | 12 27 24. What is the missing number?

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