Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 966 · 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. 1.1 + 3 + 5 + … + 21 =
2. 2.795 × ? = 7950
3. 3.111111 × 111111 =
4. 4.Magic square (every row, column and diagonal has the same total): 5 4 ? | 10 6 2 | 3 8 7. What is the missing number?
5. 5.38 × ? = 38000
6. 6.Half of 26 =
7. 7.Think of 8. Multiply it by 3, then add 1. What number do you end with?
8. 8.37 × 9 =
9. 9.12345678 × 8 + 8 =
10. 10.8 × 4 =
11. 11.Take 816. Reverse its digits and take the smaller number away from the bigger one. What do you get?
12. 12.49 × ? = 49000
13. 13.1 + 3 + 5 + … + 15 =
14. 14.Magic square (every row, column and diagonal has the same total): 10 24 ? | 20 16 12 | 18 8 22. What is the missing number?
15. 15.1 + 2 + 3 + … + 74 =
16. 16.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 79 (c) 82 (d) 81
17. 17.Magic square (every row, column and diagonal has the same total): 11 ? 7 | 4 8 12 | 9 10 5. What is the missing number?
18. 18.Double 14 =
19. 19.If today is Sunday, what day was it 14 days ago? (a) Saturday (b) Monday (c) Sunday (d) Wednesday
20. 20.Magic square (every row, column and diagonal has the same total): ? 30 15 | 12 24 36 | 33 18 21. What is the missing number?
21. 21.46 × ? = 46000
22. 22.Double 21 =
23. 23.Magic square (every row, column and diagonal has the same total): 9 8 13 | 14 10 6 | 7 ? 11. What is the missing number?
24. 24.1 + 3 + 5 + … + 27 =
25. 25.Take 41 and take away the sum of its digits. What do you get?
26. 26.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
27. 27.766 × ? = 7660
28. 28.1 + 2 + 3 + … + 55 =
29. 29.13 × 4 =
30. 30.In 5 years a boy will be 18 years old. How old was he 7 years ago?
31. 31.I thought of a number, multiplied it by 4 and added 3. I got 43. What was my number?
32. 32.2 × 9 =
33. 33.9 × 8 =
34. 34.9 × 4 =
35. 35.Magic square (every row, column and diagonal has the same total): 18 8 10 | ? 12 20 | 14 16 6. What is the missing number?
36. 36.46 × 4 =
37. 37.A father is 37 years old and his son is 9. How old was the father when the son was born?
38. 38.?141 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.61?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.9 × 6 = 5? — what is the missing digit?

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