Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 313 · 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 square (every row, column and diagonal has the same total): 24 27 12 | ? 21 33 | 30 15 18. What is the missing number?
2. 2.Double 89 =
3. 3.Magic square (every row, column and diagonal has the same total): 13 12 ? | 18 14 10 | 11 16 15. What is the missing number?
4. 4.Take 88 and take away the sum of its digits. What do you get?
5. 5.Half of 24 =
6. 6.1 + 3 + 5 + … + 31 =
7. 7.9 × 4 =
8. 8.?577 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.9 × 2 =
10. 10.Magic square (every row, column and diagonal has the same total): 5 19 9 | 15 11 7 | ? 3 17. What is the missing number?
11. 11.16 × ? = 16000
12. 12.Take 902. Reverse its digits and take the smaller number away from the bigger one. What do you get?
13. 13.118 × 10 =
14. 14.?620 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Odd one out: which number is NOT in the 4 times table? (a) 39 (b) 28 (c) 16 (d) 40
16. 16.Half of 96 =
17. 17.60 × 4 =
18. 18.37 × 18 =
19. 19.21 × 4 =
20. 20.139 × 10 =
21. 21.If today is Monday, what day was it 18 days ago? (a) Wednesday (b) Friday (c) Thursday (d) Sunday
22. 22.9 × 7 =
23. 23.If today is Saturday, what day will it be after 69 days? (a) Saturday (b) Friday (c) Thursday (d) Monday
24. 24.Take 760. Reverse its digits and take the smaller number away from the bigger one. What do you get?
25. 25.585 × 10 =
26. 26.If today is Sunday, what day was it 40 days ago? (a) Friday (b) Monday (c) Wednesday (d) Tuesday
27. 27.Do the 1089 trick with 321: reverse and subtract, then reverse that answer and add. What do you get?
28. 28.111 × 111 =
29. 29.A father is 32 years old and his son is 10. How old was the father when the son was born?
30. 30.9 × 2 = 1? — what is the missing digit?
31. 31.Magic square (every row, column and diagonal has the same total): 18 15 30 | 33 21 9 | 12 27 ?. What is the missing number?
32. 32.530 × 10 =
33. 33.Take 14 and take away the sum of its digits. What do you get?
34. 34.Magic trick! Think of 4. Double it, add 6, halve it, then take away 4. What number do you get?
35. 35.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
36. 36.560 × 10 =
37. 37.9 × 7 = ?3 — what is the missing digit?
38. 38.The ages of two twins add up to 18. How old is each twin?
39. 39.I thought of a number, added 6 and then doubled it. I got 32. What was my number?
40. 40.5 × 9 =

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