Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 3 · 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. 1.218 × 10 =
2. 2.1234 × 8 + 4 =
3. 3.1 + 2 + 3 + … + 35 =
4. 4.If today is Sunday, what day will it be after 72 days? (a) Monday (b) Friday (c) Tuesday (d) Wednesday
5. 5.I thought of a number, multiplied it by 4 and added 3. I got 11. What was my number?
6. 6.9 × 4 =
7. 7.188 × 10 =
8. 8.42 × 4 =
9. 9.Magic trick! Think of 14. Double it, add 14, halve it, then take away 14. What number do you get?
10. 10.A father is 41 years old and his son is 12. How old was the father when the son was born?
11. 11.1 + 2 + 3 + … + 63 =
12. 12.12345678 × 9 + 9 =
13. 13.6 × 4 =
14. 14.What comes next? 2, 10, 18, 26, ? (a) 34 (b) 26 (c) 35 (d) 42
15. 15.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
16. 16.37 × 3 =
17. 17.40 × 1000 =
18. 18.9 × 10 =
19. 19.Magic trick! Think of 2. Double it, add 6, halve it, then take away 2. What number do you get?
20. 20.If today is Monday, what day will it be after 84 days? (a) Tuesday (b) Thursday (c) Sunday (d) Monday
21. 21.Magic square (every row, column and diagonal has the same total): 18 20 10 | 8 16 24 | 22 ? 14. What is the missing number?
22. 22.675 × 10 =
23. 23.Magic square (every row, column and diagonal has the same total): 8 3 10 | 9 7 ? | 4 11 6. What is the missing number?
24. 24.25 × 1000 =
25. 25.8?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.1 + 2 + 3 + … + 38 =
27. 27.I thought of a number, added 3 and then doubled it. I got 26. What was my number?
28. 28.Think of 4. Multiply it by 2, then add 2. What number do you end with?
29. 29.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
30. 30.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 101 (c) 102 (d) 100
31. 31.What comes next? 8, 15, 22, 29, ? (a) 29 (b) 43 (c) 36 (d) 37
32. 32.I thought of a number, multiplied it by 4 and added 2. I got 10. What was my number?
33. 33.3 × 9 =
34. 34.9 × 5 = ?5 — what is the missing digit?
35. 35.12345679 × 63 =
36. 36.Odd one out: which number is NOT in the 5 times table? (a) 20 (b) 15 (c) 10 (d) 23
37. 37.Magic square (every row, column and diagonal has the same total): 20 10 ? | 22 18 14 | 12 26 16. What is the missing number?
38. 38.1 + 3 + 5 + … + 35 =
39. 39.44 × ? = 44000
40. 40.37 × 9 =

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