Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 649 · 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. 1.39 × 4 =
2. 2.What comes next? 16, 25, 36, 49, ? (a) 62 (b) 65 (c) 64 (d) 66
3. 3.12345679 × 36 =
4. 4.Do the 1089 trick with 920: reverse and subtract, then reverse that answer and add. What do you get?
5. 5.41 × 4 =
6. 6.Magic square (every row, column and diagonal has the same total): 33 ? 21 | 12 24 36 | 27 30 15. What is the missing number?
7. 7.1 + 3 + 5 + … + 13 =
8. 8.1 + 2 + 3 + … + 100 =
9. 9.Half of 92 =
10. 10.123456 × 9 + 7 =
11. 11.Half of 142 =
12. 12.2 × 9 =
13. 13.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
14. 14.Do the 1089 trick with 451: reverse and subtract, then reverse that answer and add. What do you get?
15. 15.What comes next? 19, 28, 37, 46, ? (a) 64 (b) 55 (c) 46 (d) 56
16. 16.Magic square (every row, column and diagonal has the same total): 13 8 15 | ? 12 10 | 9 16 11. What is the missing number?
17. 17.Half of 52 =
18. 18.37 × 12 =
19. 19.Magic trick! Think of 16. Double it, add 18, halve it, then take away 16. What number do you get?
20. 20.Odd one out: which number is NOT in the 6 times table? (a) 12 (b) 30 (c) 48 (d) 49
21. 21.A father is 39 years old and his son is 10. How old was the father when the son was born?
22. 22.Double 69 =
23. 23.9 × 2 =
24. 24.61 × 100 =
25. 25.14 × 1000 =
26. 26.I thought of a number, multiplied it by 4 and added 7. I got 27. What was my number?
27. 27.Magic trick! Think of 15. Double it, add 14, halve it, then take away 15. What number do you get?
28. 28.9 × 4 = 3? — what is the missing digit?
29. 29.1 + 2 + 3 + … + 65 =
30. 30.11 × 11 =
31. 31.7 × 4 =
32. 32.Double 24 =
33. 33.1 + 2 + 3 + … + 36 =
34. 34.What comes next? 2, 4, 8, 16, ? (a) 28 (b) 33 (c) 32 (d) 24
35. 35.9 × 6 = 5? — what is the missing digit?
36. 36.A girl is 11 years old and her brother is 6 years older. How old will her brother be in 4 years?
37. 37.9 × 10 = 9? — what is the missing digit?
38. 38.12345679 × 63 =
39. 39.If today is Saturday, what day will it be after 61 days? (a) Sunday (b) Wednesday (c) Friday (d) Thursday
40. 40.9 × 6 = ?4 — what is the missing digit?

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