Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 940 · 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.Take 770. Reverse its digits and take the smaller number away from the bigger one. What do you get?
2. 2.43 × 4 =
3. 3.Double 38 =
4. 4.426? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.Magic square (every row, column and diagonal has the same total): 17 32 11 | 14 ? 26 | 29 8 23. What is the missing number?
6. 6.Magic square (every row, column and diagonal has the same total): 26 ? 20 | 11 17 23 | 14 29 8. What is the missing number?
7. 7.36 × 4 =
8. 8.Magic square (every row, column and diagonal has the same total): 9 16 11 | 14 12 ? | 13 8 15. What is the missing number?
9. 9.42 × ? = 4200
10. 10.Magic square (every row, column and diagonal has the same total): 7 2 9 | 8 6 4 | ? 10 5. What is the missing number?
11. 11.123 × 9 + 4 =
12. 12.9 × 2 = 1? — what is the missing digit?
13. 13.111111 × 111111 =
14. 14.37 × 18 =
15. 15.Double 21 =
16. 16.6 × 9 =
17. 17.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 65 (c) 62 (d) 64
18. 18.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
19. 19.Magic square (every row, column and diagonal has the same total): 26 ? 14 | 5 17 29 | 20 23 8. What is the missing number?
20. 20.12 × 8 + 2 =
21. 21.1111 × 1111 =
22. 22.Magic square (every row, column and diagonal has the same total): 4 18 ? | 14 10 6 | 12 2 16. What is the missing number?
23. 23.9 × 8 =
24. 24.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
25. 25.Think of 9. Multiply it by 5, then add 6. What number do you end with?
26. 26.1 + 3 + 5 + … + 45 =
27. 27.21 × 4 =
28. 28.11111 × 11111 =
29. 29.5 × 9 =
30. 30.2 × 9 =
31. 31.9 × 10 =
32. 32.792 + 297 =
33. 33.Think of 10. Multiply it by 4, then add 7. What number do you end with?
34. 34.A father is 32 years old and his son is 7. How old was the father when the son was born?
35. 35.Take 97 and take away the sum of its digits. What do you get?
36. 36.Think of 10. Multiply it by 5, then add 3. What number do you end with?
37. 37.What comes next? 13, 15, 17, 19, ? (a) 22 (b) 19 (c) 21 (d) 23
38. 38.468 × ? = 4680
39. 39.9 × 7 =
40. 40.I thought of a number, multiplied it by 4 and added 5. I got 65. What was my number?

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