Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 530 · 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.Magic trick! Think of 6. Double it, add 6, halve it, then take away 6. What number do you get?
2. 2.Magic square (every row, column and diagonal has the same total): 11 32 17 | 26 20 14 | ? 8 29. What is the missing number?
3. 3.638 × 10 =
4. 4.The 1st of a month is a Sunday. What day is the 9th of the same month? (a) Monday (b) Sunday (c) Thursday (d) Tuesday
5. 5.31 × ? = 3100
6. 6.9 × 6 = ?4 — what is the missing digit?
7. 7.32 × ? = 32000
8. 8.Magic trick! Think of 19. Double it, add 6, halve it, then take away 19. What number do you get?
9. 9.9 × 10 =
10. 10.97? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.I thought of a number, added 1 and then doubled it. I got 32. What was my number?
12. 12.967 × 10 =
13. 13.1 × 9 =
14. 14.Take 355. Reverse its digits and take the smaller number away from the bigger one. What do you get?
15. 15.Magic trick! Think of 17. Double it, add 16, halve it, then take away 17. What number do you get?
16. 16.9 × 4 = ?6 — what is the missing digit?
17. 17.10 × 9 =
18. 18.Magic square (every row, column and diagonal has the same total): 11 21 7 | ? 13 17 | 19 5 15. What is the missing number?
19. 19.9 × 3 = ?7 — what is the missing digit?
20. 20.Magic square (every row, column and diagonal has the same total): 20 23 8 | ? 17 29 | 26 11 14. What is the missing number?
21. 21.21 × 4 =
22. 22.Think of 6. Multiply it by 2, then add 2. What number do you end with?
23. 23.14 × 4 =
24. 24.7?77 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.If today is Monday, what day will it be after 47 days? (a) Friday (b) Tuesday (c) Sunday (d) Saturday
26. 26.35 × 1000 =
27. 27.9 × 9 =
28. 28.Take 77 and take away the sum of its digits. What do you get?
29. 29.Magic square (every row, column and diagonal has the same total): 15 ? 21 | 30 24 18 | 27 12 33. What is the missing number?
30. 30.Do the 1089 trick with 910: reverse and subtract, then reverse that answer and add. What do you get?
31. 31.31 × 4 =
32. 32.What comes next? 2, 5, 8, 11, ? (a) 11 (b) 14 (c) 15 (d) 17
33. 33.Take 133. Reverse its digits and take the smaller number away from the bigger one. What do you get?
34. 34.54 × 4 =
35. 35.What comes next? 25, 36, 49, 64, ? (a) 81 (b) 82 (c) 83 (d) 79
36. 36.5 × 9 =
37. 37.25 × 4 =
38. 38.Half of 42 =
39. 39.Half of 62 =
40. 40.Double 78 =

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