Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 348 · 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. 1.44 × 4 =
2. 2.Think of 15. Multiply it by 4, then add 1. What number do you end with?
3. 3.?004 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.What comes next? 3, 8, 13, 18, ? (a) 18 (b) 23 (c) 24 (d) 28
5. 5.9 × 4 = 3? — what is the missing digit?
6. 6.6 × 9 =
7. 7.What comes next? 3, 6, 12, 24, ? (a) 48 (b) 36 (c) 42 (d) 49
8. 8.I thought of a number, multiplied it by 2 and added 4. I got 32. What was my number?
9. 9.If today is Monday, what day was it 60 days ago? (a) Thursday (b) Sunday (c) Wednesday (d) Friday
10. 10.Take 820. Reverse its digits and take the smaller number away from the bigger one. What do you get?
11. 11.I thought of a number, multiplied it by 3 and added 1. I got 43. What was my number?
12. 12.A father is 37 years old and his son is 8. How old was the father when the son was born?
13. 13.11 × 4 =
14. 14.1 + 3 + 5 + … + 47 =
15. 15.I thought of a number, multiplied it by 4 and added 7. I got 23. What was my number?
16. 16.If today is Sunday, what day was it 51 days ago? (a) Saturday (b) Thursday (c) Friday (d) Monday
17. 17.123456789 × 8 + 9 =
18. 18.9 × 1 =
19. 19.If today is Tuesday, what day will it be after 88 days? (a) Tuesday (b) Friday (c) Saturday (d) Sunday
20. 20.37 × 4 =
21. 21.If today is Sunday, what day will it be after 98 days? (a) Monday (b) Saturday (c) Wednesday (d) Sunday
22. 22.11111 × 11111 =
23. 23.Magic trick! Think of 6. Double it, add 6, halve it, then take away 6. What number do you get?
24. 24.56 × 4 =
25. 25.Magic square (every row, column and diagonal has the same total): 18 8 22 | 20 ? 12 | 10 24 14. What is the missing number?
26. 26.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
27. 27.Take 73 and take away the sum of its digits. What do you get?
28. 28.A girl is 9 years old and her brother is 2 years older. How old will her brother be in 3 years?
29. 29.9 × 4 =
30. 30.1 + 2 + 3 + … + 18 =
31. 31.Magic square (every row, column and diagonal has the same total): 12 22 8 | 10 14 18 | 20 6 ?. What is the missing number?
32. 32.11 × 11 =
33. 33.1 + 3 + 5 + … + 27 =
34. 34.9 × 2 =
35. 35.Magic trick! Think of 10. Double it, add 10, halve it, then take away 10. What number do you get?
36. 36.1234 × 9 + 5 =
37. 37.Magic square (every row, column and diagonal has the same total): 21 ? 33 | 36 24 12 | 15 30 27. What is the missing number?
38. 38.What comes next? 2, 4, 8, 16, ? (a) 28 (b) 24 (c) 33 (d) 32
39. 39.Do the 1089 trick with 760: reverse and subtract, then reverse that answer and add. What do you get?
40. 40.Double 11 =

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