Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 310 · 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. 2.9 × 4 = 3? — what is the missing digit?
3. 3.I thought of a number, multiplied it by 3 and added 3. I got 30. What was my number?
4. 4.4?97 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.111 × 111 =
6. 6.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
7. 7.1 + 3 + 5 + … + 19 =
8. 8.2 × 9 =
9. 9.I thought of a number, multiplied it by 3 and added 9. I got 45. What was my number?
10. 10.26 × 4 =
11. 11.Double 17 =
12. 12.I thought of a number, multiplied it by 3 and added 3. I got 15. What was my number?
13. 13.54 × 100 =
14. 14.12345 × 9 + 6 =
15. 15.1 + 2 + 3 + … + 31 =
16. 16.Take 60 and take away the sum of its digits. What do you get?
17. 17.17 × ? = 17000
18. 18.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
19. 19.Double 83 =
20. 20.12345679 × 18 =
21. 21.12 × 1000 =
22. 22.9 × 10 =
23. 23.Magic square (every row, column and diagonal has the same total): 8 9 4 | 3 7 11 | 10 5 ?. What is the missing number?
24. 24.73 × 100 =
25. 25.1 + 3 + 5 + … + 13 =
26. 26.Magic square (every row, column and diagonal has the same total): ? 9 16 | 15 13 11 | 10 17 12. What is the missing number?
27. 27.9 × 3 = 2? — what is the missing digit?
28. 28.The 9th of a month is a Thursday. What day is the 30th of the same month? (a) Friday (b) Wednesday (c) Sunday (d) Thursday
29. 29.A father is 40 years old and his son is 9. How old was the father when the son was born?
30. 30.Magic square (every row, column and diagonal has the same total): 8 1 ? | 3 5 7 | 4 9 2. What is the missing number?
31. 31.Magic square (every row, column and diagonal has the same total): 13 3 17 | 15 11 7 | 5 ? 9. What is the missing number?
32. 32.Take 761. Reverse its digits and take the smaller number away from the bigger one. What do you get?
33. 33.179 × ? = 1790
34. 34.9 × 7 = 6? — what is the missing digit?
35. 35.32 × 4 =
36. 36.7 × 4 =
37. 37.What comes next? 4, 11, 18, 25, ? (a) 25 (b) 39 (c) 32 (d) 33
38. 38.1 + 3 + 5 + … + 41 =
39. 39.Magic square (every row, column and diagonal has the same total): 19 9 23 | 21 17 13 | 11 ? 15. What is the missing number?
40. 40.Magic trick! Think of 14. Double it, add 4, halve it, then take away 14. What number do you get?

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