Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 677 · 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. 1.8 × 9 =
2. 2.I thought of a number, multiplied it by 2 and added 1. I got 25. What was my number?
3. 3.Double 64 =
4. 4.9 × 4 =
5. 5.Take 205. Reverse its digits and take the smaller number away from the bigger one. What do you get?
6. 6.Half of 78 =
7. 7.12345679 × 36 =
8. 8.What comes next? 2, 5, 8, 11, ? (a) 17 (b) 15 (c) 14 (d) 11
9. 9.40 × ? = 40000
10. 10.The 5th of a month is a Wednesday. What day is the 29th of the same month? (a) Saturday (b) Friday (c) Tuesday (d) Sunday
11. 11.The 9th of a month is a Tuesday. What day is the 30th of the same month? (a) Friday (b) Monday (c) Tuesday (d) Wednesday
12. 12.I thought of a number, multiplied it by 2 and added 2. I got 32. What was my number?
13. 13.Double 17 =
14. 14.6 × 9 =
15. 15.Do the 1089 trick with 395: reverse and subtract, then reverse that answer and add. What do you get?
16. 16.In 6 years a boy will be 18 years old. How old was he 2 years ago?
17. 17.9 × 3 =
18. 18.47 × 1000 =
19. 19.Take 84 and take away the sum of its digits. What do you get?
20. 20.Take 329. Reverse its digits and take the smaller number away from the bigger one. What do you get?
21. 21.4 × 9 =
22. 22.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
23. 23.48 × 4 =
24. 24.5?88 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.38 × 4 =
26. 26.A father is 31 years old and his son is 9. How old was the father when the son was born?
27. 27.Double 34 =
28. 28.If today is Saturday, what day was it 56 days ago? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
29. 29.24 × 4 =
30. 30.1 × 9 =
31. 31.Magic square (every row, column and diagonal has the same total): 11 6 13 | 12 10 8 | ? 14 9. What is the missing number?
32. 32.The ages of two twins add up to 20. How old is each twin?
33. 33.19 × 1000 =
34. 34.Think of 9. Multiply it by 4, then add 1. What number do you end with?
35. 35.The ages of two twins add up to 28. How old is each twin?
36. 36.Double 31 =
37. 37.61 × 100 =
38. 38.275 × 10 =
39. 39.The 6th of a month is a Saturday. What day is the 21st of the same month? (a) Saturday (b) Monday (c) Wednesday (d) Sunday
40. 40.797? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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