Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 285 · 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.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
2. 2.?680 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.Magic square (every row, column and diagonal has the same total): 15 ? 11 | 13 17 21 | 23 9 19. What is the missing number?
4. 4.The 3rd of a month is a Wednesday. What day is the 22nd of the same month? (a) Monday (b) Thursday (c) Tuesday (d) Sunday
5. 5.1 + 3 + 5 + … + 15 =
6. 6.Half of 98 =
7. 7.Take 15 and take away the sum of its digits. What do you get?
8. 8.12 × 8 + 2 =
9. 9.1 + 2 + 3 + … + 50 =
10. 10.Think of 13. Multiply it by 3, then add 2. What number do you end with?
11. 11.9 × 3 = 2? — what is the missing digit?
12. 12.If today is Tuesday, what day was it 10 days ago? (a) Saturday (b) Friday (c) Tuesday (d) Sunday
13. 13.Magic square (every row, column and diagonal has the same total): 20 23 8 | 5 17 29 | 26 11 ?. What is the missing number?
14. 14.198 + 891 =
15. 15.3?27 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.55 × 4 =
17. 17.Take 85 and take away the sum of its digits. What do you get?
18. 18.Double 61 =
19. 19.The 5th of a month is a Saturday. What day is the 24th of the same month? (a) Sunday (b) Friday (c) Wednesday (d) Thursday
20. 20.What comes next? 1, 4, 9, 16, ? (a) 23 (b) 25 (c) 27 (d) 26
21. 21.Double 38 =
22. 22.Take 47 and take away the sum of its digits. What do you get?
23. 23.37 × 6 =
24. 24.2 × 9 =
25. 25.768 × ? = 7680
26. 26.9 × 4 =
27. 27.111111 × 111111 =
28. 28.31 × ? = 3100
29. 29.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
30. 30.9 × 2 = ?8 — what is the missing digit?
31. 31.10 × 9 =
32. 32.8?32 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.Half of 194 =
34. 34.Magic square (every row, column and diagonal has the same total): 12 26 16 | 22 ? 14 | 20 10 24. What is the missing number?
35. 35.Do the 1089 trick with 602: reverse and subtract, then reverse that answer and add. What do you get?
36. 36.37 × 21 =
37. 37.What comes next? 9, 16, 25, 36, ? (a) 50 (b) 49 (c) 47 (d) 51
38. 38.Half of 88 =
39. 39.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 12 (c) 14 (d) 17
40. 40.What comes next? 4, 8, 16, 32, ? (a) 65 (b) 64 (c) 56 (d) 48

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