Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 731 · 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.Take 56 and take away the sum of its digits. What do you get?
2. 2.I thought of a number, added 4 and then doubled it. I got 20. What was my number?
3. 3.6?69 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.9 × 8 = 7? — what is the missing digit?
5. 5.Double 44 =
6. 6.A girl is 5 years old and her brother is 5 years older. How old will her brother be in 4 years?
7. 7.1 + 2 + 3 + … + 38 =
8. 8.12345 × 9 + 6 =
9. 9.If today is Saturday, what day was it 14 days ago? (a) Sunday (b) Friday (c) Tuesday (d) Saturday
10. 10.24 × 4 =
11. 11.8 × 9 =
12. 12.Half of 138 =
13. 13.12 × 8 + 2 =
14. 14.68 × 100 =
15. 15.Half of 166 =
16. 16.What comes next? 3, 6, 12, 24, ? (a) 42 (b) 36 (c) 49 (d) 48
17. 17.If today is Sunday, what day was it 42 days ago? (a) Monday (b) Saturday (c) Wednesday (d) Sunday
18. 18.9 × 10 = 9? — what is the missing digit?
19. 19.What comes next? 36, 49, 64, 81, ? (a) 101 (b) 102 (c) 100 (d) 98
20. 20.Magic square (every row, column and diagonal has the same total): ? 14 13 | 16 12 8 | 11 10 15. What is the missing number?
21. 21.Half of 98 =
22. 22.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
23. 23.12 × ? = 12000
24. 24.123 × 9 + 4 =
25. 25.Magic trick! Think of 6. Double it, add 4, halve it, then take away 6. What number do you get?
26. 26.Magic square (every row, column and diagonal has the same total): 21 36 15 | 18 24 30 | 33 12 ?. What is the missing number?
27. 27.Take 58 and take away the sum of its digits. What do you get?
28. 28.12345679 × 9 =
29. 29.9 × 10 =
30. 30.Magic square (every row, column and diagonal has the same total): 33 12 27 | 18 24 ? | 21 36 15. What is the missing number?
31. 31.9 × 2 =
32. 32.1 + 2 + 3 + … + 96 =
33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
34. 34.9 × 6 = 5? — what is the missing digit?
35. 35.43 × 4 =
36. 36.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
37. 37.537 × 10 =
38. 38.1111 × 1111 =
39. 39.Magic square (every row, column and diagonal has the same total): 25 11 21 | 15 19 ? | 17 27 13. What is the missing number?
40. 40.1 + 2 + 3 + … + 43 =

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