Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 47 · 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 × 9 = 8? — what is the missing digit?
2. 2.Take 910. Reverse its digits and take the smaller number away from the bigger one. What do you get?
3. 3.A father is 44 years old and his son is 14. How old was the father when the son was born?
4. 4.A father is 32 years old and his son is 8. How old was the father when the son was born?
5. 5.9 × 3 =
6. 6.29 × ? = 29000
7. 7.Do the 1089 trick with 833: reverse and subtract, then reverse that answer and add. What do you get?
8. 8.Double 28 =
9. 9.Take 93 and take away the sum of its digits. What do you get?
10. 10.906 × ? = 9060
11. 11.?321 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.If today is Tuesday, what day will it be after 27 days? (a) Monday (b) Sunday (c) Tuesday (d) Thursday
13. 13.Half of 54 =
14. 14.1 × 9 =
15. 15.Take 12 and take away the sum of its digits. What do you get?
16. 16.Take 158. Reverse its digits and take the smaller number away from the bigger one. What do you get?
17. 17.8 × 9 =
18. 18.9 × 4 = 3? — what is the missing digit?
19. 19.7 × 4 =
20. 20.Magic square (every row, column and diagonal has the same total): 5 19 9 | ? 11 7 | 13 3 17. What is the missing number?
21. 21.491 × ? = 4910
22. 22.19 × 4 =
23. 23.Half of 102 =
24. 24.48 × 4 =
25. 25.Magic square (every row, column and diagonal has the same total): ? 35 20 | 29 23 17 | 26 11 32. What is the missing number?
26. 26.783 × 10 =
27. 27.9 × 1 =
28. 28.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
29. 29.Odd one out: which number is NOT in the 9 times table? (a) 54 (b) 63 (c) 36 (d) 26
30. 30.I thought of a number, added 6 and then doubled it. I got 26. What was my number?
31. 31.Magic trick! Think of 8. Double it, add 4, halve it, then take away 8. What number do you get?
32. 32.A girl is 11 years old and her brother is 4 years older. How old will her brother be in 6 years?
33. 33.The 2nd of a month is a Wednesday. What day is the 17th of the same month? (a) Wednesday (b) Thursday (c) Friday (d) Sunday
34. 34.12345679 × 72 =
35. 35.Double 25 =
36. 36.191 × ? = 1910
37. 37.Take 88 and take away the sum of its digits. What do you get?
38. 38.9 × 8 =
39. 39.Magic square (every row, column and diagonal has the same total): ? 13 8 | 7 11 15 | 14 9 10. What is the missing number?
40. 40.1 + 2 + 3 + … + 27 =

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