Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 961 · 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 × 4 =
2. 2.Half of 132 =
3. 3.9 × 10 = ?0 — what is the missing digit?
4. 4.If today is Monday, what day was it 22 days ago? (a) Saturday (b) Sunday (c) Monday (d) Wednesday
5. 5.10 × 4 =
6. 6.1 × 9 =
7. 7.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
8. 8.1 + 3 + 5 + … + 13 =
9. 9.Double 41 =
10. 10.1 + 2 + 3 + … + 15 =
11. 11.1 + 2 + 3 + … + 95 =
12. 12.9 × 8 = 7? — what is the missing digit?
13. 13.1 + 3 + 5 + … + 49 =
14. 14.32 × 4 =
15. 15.Magic trick! Think of 20. Double it, add 10, halve it, then take away 20. What number do you get?
16. 16.Take 11 and take away the sum of its digits. What do you get?
17. 17.1 + 2 + 3 + … + 16 =
18. 18.I thought of a number, added 8 and then doubled it. I got 50. What was my number?
19. 19.A father is 36 years old and his son is 12. How old was the father when the son was born?
20. 20.I thought of a number, added 4 and then doubled it. I got 38. What was my number?
21. 21.7?59 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.1 + 2 + 3 + … + 59 =
23. 23.33 × ? = 3300
24. 24.1 + 2 + 3 + … + 94 =
25. 25.Magic square (every row, column and diagonal has the same total): 20 6 16 | 10 14 18 | 12 ? 8. What is the missing number?
26. 26.Half of 22 =
27. 27.9 × 10 = 9? — what is the missing digit?
28. 28.1 + 2 + 3 + … + 80 =
29. 29.2 × 9 =
30. 30.6?17 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.976 × 10 =
32. 32.I thought of a number, added 8 and then doubled it. I got 34. What was my number?
33. 33.9 × 1 =
34. 34.What comes next? 4, 13, 22, 31, ? (a) 40 (b) 31 (c) 41 (d) 49
35. 35.27 × 4 =
36. 36.45 × ? = 45000
37. 37.Magic square (every row, column and diagonal has the same total): 7 6 11 | ? 8 4 | 5 10 9. What is the missing number?
38. 38.1 + 3 + 5 + … + 9 =
39. 39.Magic square (every row, column and diagonal has the same total): 6 11 4 | 5 ? 9 | 10 3 8. What is the missing number?
40. 40.Magic trick! Think of 14. Double it, add 12, halve it, then take away 14. What number do you get?

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