Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 990 · 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.What comes next? 14, 16, 18, 20, ? (a) 23 (b) 20 (c) 24 (d) 22
2. 2.1 + 2 + 3 + … + 26 =
3. 3.Half of 196 =
4. 4.9 × 3 = 2? — what is the missing digit?
5. 5.The ages of two twins add up to 28. How old is each twin?
6. 6.The 3rd of a month is a Saturday. What day is the 15th of the same month? (a) Wednesday (b) Sunday (c) Thursday (d) Friday
7. 7.Think of 7. Multiply it by 2, then add 7. What number do you end with?
8. 8.Magic trick! Think of 3. Double it, add 16, halve it, then take away 3. What number do you get?
9. 9.321 × 10 =
10. 10.Double 99 =
11. 11.What comes next? 2, 9, 16, 23, ? (a) 37 (b) 23 (c) 30 (d) 31
12. 12.1 × 9 =
13. 13.Think of 10. Multiply it by 4, then add 8. What number do you end with?
14. 14.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 81 (c) 80 (d) 70
15. 15.4 × 9 =
16. 16.1 + 2 + 3 + … + 77 =
17. 17.Half of 148 =
18. 18.9 × 4 = ?6 — what is the missing digit?
19. 19.37 × 9 =
20. 20.Take 29 and take away the sum of its digits. What do you get?
21. 21.I thought of a number, added 2 and then doubled it. I got 22. What was my number?
22. 22.257 × ? = 2570
23. 23.What comes next? 5, 11, 17, 23, ? (a) 30 (b) 35 (c) 29 (d) 23
24. 24.76 × ? = 7600
25. 25.Half of 138 =
26. 26.12345679 × 18 =
27. 27.52 × 4 =
28. 28.9 × 2 = 1? — what is the missing digit?
29. 29.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
30. 30.I thought of a number, multiplied it by 4 and added 5. I got 29. What was my number?
31. 31.The ages of two twins add up to 12. How old is each twin?
32. 32.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
33. 33.Half of 172 =
34. 34.198 + 891 =
35. 35.12345679 × 45 =
36. 36.1 + 3 + 5 + … + 15 =
37. 37.I thought of a number, multiplied it by 3 and added 2. I got 47. What was my number?
38. 38.60 × ? = 6000
39. 39.Magic trick! Think of 11. Double it, add 10, halve it, then take away 11. What number do you get?
40. 40.9 × 5 = ?5 — what is the missing digit?

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