Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 191 · 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. 1.9 × 2 = ?8 — what is the missing digit?
2. 2.A father is 36 years old and his son is 12. How old was the father when the son was born?
3. 3.Magic square (every row, column and diagonal has the same total): 14 29 26 | ? 23 11 | 20 17 32. What is the missing number?
4. 4.9 × 8 =
5. 5.6 × 4 =
6. 6.I thought of a number, added 6 and then doubled it. I got 18. What was my number?
7. 7.9 × 6 = 5? — what is the missing digit?
8. 8.1 + 3 + 5 + … + 15 =
9. 9.12 × 9 + 3 =
10. 10.1 + 2 + 3 + … + 18 =
11. 11.34 × 4 =
12. 12.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
13. 13.97 × 100 =
14. 14.9 × 5 = ?5 — what is the missing digit?
15. 15.Do the 1089 trick with 792: reverse and subtract, then reverse that answer and add. What do you get?
16. 16.Double 66 =
17. 17.9 × 4 = ?6 — what is the missing digit?
18. 18.11 × 11 =
19. 19.Half of 14 =
20. 20.1 × 9 =
21. 21.Magic square (every row, column and diagonal has the same total): 9 30 15 | 24 18 12 | ? 6 27. What is the missing number?
22. 22.860 × 10 =
23. 23.18 × 4 =
24. 24.Do the 1089 trick with 930: reverse and subtract, then reverse that answer and add. What do you get?
25. 25.7 × 4 =
26. 26.Take 198. Reverse its digits and take the smaller number away from the bigger one. What do you get?
27. 27.21 × 1000 =
28. 28.10 × 9 =
29. 29.Do the 1089 trick with 169: reverse and subtract, then reverse that answer and add. What do you get?
30. 30.I thought of a number, multiplied it by 2 and added 1. I got 15. What was my number?
31. 31.111 × 111 =
32. 32.Think of 3. Multiply it by 3, then add 3. What number do you end with?
33. 33.1234 × 9 + 5 =
34. 34.83 × 100 =
35. 35.9 × 2 = 1? — what is the missing digit?
36. 36.Odd one out: which number is NOT in the 6 times table? (a) 20 (b) 12 (c) 42 (d) 30
37. 37.130? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.1 + 3 + 5 + … + 23 =
39. 39.1 + 2 + 3 + … + 11 =
40. 40.What comes next? 14, 21, 28, 35, ? (a) 35 (b) 42 (c) 49 (d) 43

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