Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 474 · 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.Double 39 =
2. 2.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 64 (c) 62 (d) 65
3. 3.52 × 4 =
4. 4.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 17 (c) 12 (d) 16
5. 5.I thought of a number, multiplied it by 2 and added 1. I got 13. What was my number?
6. 6.The 2nd of a month is a Saturday. What day is the 29th of the same month? (a) Monday (b) Friday (c) Thursday (d) Saturday
7. 7.11 × 4 =
8. 8.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 42 (c) 49 (d) 48
9. 9.Odd one out: which number is NOT in the 5 times table? (a) 37 (b) 25 (c) 15 (d) 10
10. 10.1 + 2 + 3 + … + 80 =
11. 11.I thought of a number, added 3 and then doubled it. I got 16. What was my number?
12. 12.Magic trick! Think of 6. Double it, add 4, halve it, then take away 6. What number do you get?
13. 13.Double 67 =
14. 14.1 + 2 + 3 + … + 35 =
15. 15.Take 41 and take away the sum of its digits. What do you get?
16. 16.Magic square (every row, column and diagonal has the same total): ? 15 10 | 9 13 17 | 16 11 12. What is the missing number?
17. 17.39 × 1000 =
18. 18.Half of 66 =
19. 19.37 × 21 =
20. 20.Double 62 =
21. 21.17 × 4 =
22. 22.9 × 6 = 5? — what is the missing digit?
23. 23.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
24. 24.694? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.9 × 9 =
26. 26.Take 792. Reverse its digits and take the smaller number away from the bigger one. What do you get?
27. 27.1234 × 8 + 4 =
28. 28.21 × 4 =
29. 29.1 + 2 + 3 + … + 13 =
30. 30.502? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.Take 902. Reverse its digits and take the smaller number away from the bigger one. What do you get?
32. 32.1 + 2 + 3 + … + 60 =
33. 33.Double 32 =
34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
35. 35.35 × 4 =
36. 36.What comes next? 7, 16, 25, 34, ? (a) 43 (b) 44 (c) 52 (d) 34
37. 37.38 × 4 =
38. 38.Double 21 =
39. 39.1 + 2 + 3 + … + 40 =
40. 40.Magic trick! Think of 18. Double it, add 8, halve it, then take away 18. What number do you get?

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