Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 88 · 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. 1.14 × ? = 1400
2. 2.9 × 4 =
3. 3.?224 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.Do the 1089 trick with 430: reverse and subtract, then reverse that answer and add. What do you get?
5. 5.9 × 2 = ?8 — what is the missing digit?
6. 6.If today is Monday, what day will it be after 96 days? (a) Friday (b) Sunday (c) Tuesday (d) Saturday
7. 7.38?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.25 × ? = 25000
9. 9.297 + 792 =
10. 10.22 × 1000 =
11. 11.167 × 10 =
12. 12.2 × 9 =
13. 13.111 × 111 =
14. 14.If today is Sunday, what day was it 17 days ago? (a) Wednesday (b) Sunday (c) Thursday (d) Friday
15. 15.Take 930. Reverse its digits and take the smaller number away from the bigger one. What do you get?
16. 16.37 × 6 =
17. 17.30 × 1000 =
18. 18.4?63 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.3 × 9 =
20. 20.39 × 4 =
21. 21.A father is 39 years old and his son is 8. How old was the father when the son was born?
22. 22.28 × 4 =
23. 23.I thought of a number, multiplied it by 2 and added 7. I got 21. What was my number?
24. 24.4 × 9 =
25. 25.1 + 3 + 5 + … + 17 =
26. 26.9 × 10 = ?0 — what is the missing digit?
27. 27.9 × 6 = ?4 — what is the missing digit?
28. 28.The ages of two twins add up to 20. How old is each twin?
29. 29.In 4 years a boy will be 15 years old. How old was he 4 years ago?
30. 30.Magic square (every row, column and diagonal has the same total): 24 ? 16 | 10 18 26 | 20 22 12. What is the missing number?
31. 31.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
32. 32.12345679 × 81 =
33. 33.Double 85 =
34. 34.9 × 9 =
35. 35.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
36. 36.Think of 7. Multiply it by 5, then add 1. What number do you end with?
37. 37.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 80 (c) 60 (d) 81
38. 38.405 × ? = 4050
39. 39.Magic square (every row, column and diagonal has the same total): 11 6 13 | 12 10 8 | 7 14 ?. What is the missing number?
40. 40.9 × 1 =

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