Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 936 · 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.I thought of a number, multiplied it by 3 and added 4. I got 31. What was my number?
2. 2.I thought of a number, multiplied it by 2 and added 6. I got 10. What was my number?
3. 3.Magic square (every row, column and diagonal has the same total): 8 ? 16 | 22 14 6 | 12 10 20. What is the missing number?
4. 4.Think of 11. Multiply it by 2, then add 7. What number do you end with?
5. 5.9 × 3 = ?7 — what is the missing digit?
6. 6.1 + 3 + 5 + … + 23 =
7. 7.A girl is 6 years old and her brother is 3 years older. How old will her brother be in 2 years?
8. 8.Magic trick! Think of 18. Double it, add 8, halve it, then take away 18. What number do you get?
9. 9.12345 × 9 + 6 =
10. 10.Magic trick! Think of 3. Double it, add 12, halve it, then take away 3. What number do you get?
11. 11.Magic square (every row, column and diagonal has the same total): 9 30 15 | 24 18 12 | 21 6 ?. What is the missing number?
12. 12.If today is Thursday, what day will it be after 45 days? (a) Saturday (b) Monday (c) Sunday (d) Wednesday
13. 13.If today is Thursday, what day was it 10 days ago? (a) Thursday (b) Sunday (c) Monday (d) Tuesday
14. 14.17 × 4 =
15. 15.If today is Sunday, what day will it be after 87 days? (a) Saturday (b) Thursday (c) Tuesday (d) Wednesday
16. 16.Magic square (every row, column and diagonal has the same total): 10 15 ? | 9 11 13 | 14 7 12. What is the missing number?
17. 17.Take 63 and take away the sum of its digits. What do you get?
18. 18.9 × 2 = 1? — what is the missing digit?
19. 19.Magic square (every row, column and diagonal has the same total): 11 4 9 | ? 8 10 | 7 12 5. What is the missing number?
20. 20.1 + 2 + 3 + … + 67 =
21. 21.5 × ? = 5000
22. 22.What comes next? 10, 19, 28, 37, ? (a) 37 (b) 47 (c) 46 (d) 55
23. 23.37 × 24 =
24. 24.52 × 4 =
25. 25.Half of 114 =
26. 26.1 + 3 + 5 + … + 17 =
27. 27.I thought of a number, multiplied it by 5 and added 9. I got 39. What was my number?
28. 28.42 × 4 =
29. 29.Half of 18 =
30. 30.9 × 5 = 4? — what is the missing digit?
31. 31.4 × 9 =
32. 32.Take 49 and take away the sum of its digits. What do you get?
33. 33.If today is Wednesday, what day will it be after 96 days? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
34. 34.435 × 10 =
35. 35.123 × 9 + 4 =
36. 36.8 × 9 =
37. 37.The 7th of a month is a Wednesday. What day is the 25th of the same month? (a) Wednesday (b) Monday (c) Saturday (d) Sunday
38. 38.The 3rd of a month is a Tuesday. What day is the 30th of the same month? (a) Tuesday (b) Sunday (c) Monday (d) Thursday
39. 39.Magic square (every row, column and diagonal has the same total): 7 12 11 | 14 10 ? | 9 8 13. What is the missing number?
40. 40.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?

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