Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 90 · 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. 1.36 × 1000 =
2. 2.111111 × 111111 =
3. 3.Magic square (every row, column and diagonal has the same total): 5 ? 13 | 19 11 3 | 9 7 17. What is the missing number?
4. 4.Double 21 =
5. 5.Take 127. Reverse its digits and take the smaller number away from the bigger one. What do you get?
6. 6.I thought of a number, added 9 and then doubled it. I got 36. What was my number?
7. 7.47 × 4 =
8. 8.Double 74 =
9. 9.9 × 2 = ?8 — what is the missing digit?
10. 10.53 × 4 =
11. 11.Magic square (every row, column and diagonal has the same total): 12 27 6 | 9 15 21 | ? 3 18. What is the missing number?
12. 12.Odd one out: which number is NOT in the 4 times table? (a) 16 (b) 29 (c) 28 (d) 32
13. 13.79?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.1 + 2 + 3 + … + 12 =
15. 15.11 × 11 =
16. 16.1 + 3 + 5 + … + 21 =
17. 17.Double 66 =
18. 18.I thought of a number, multiplied it by 3 and added 8. I got 53. What was my number?
19. 19.Magic square (every row, column and diagonal has the same total): 9 19 17 | 23 15 7 | 13 11 ?. What is the missing number?
20. 20.In 5 years a boy will be 17 years old. How old was he 3 years ago?
21. 21.Magic trick! Think of 2. Double it, add 8, halve it, then take away 2. What number do you get?
22. 22.15 × 1000 =
23. 23.37 × 4 =
24. 24.1 + 2 + 3 + … + 63 =
25. 25.74 × 100 =
26. 26.Half of 142 =
27. 27.12345678 × 9 + 9 =
28. 28.A girl is 12 years old and her brother is 6 years older. How old will her brother be in 3 years?
29. 29.Take 17 and take away the sum of its digits. What do you get?
30. 30.Half of 152 =
31. 31.55 × 4 =
32. 32.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 28 (c) 24 (d) 32
33. 33.Magic square (every row, column and diagonal has the same total): 10 5 6 | 3 7 ? | 8 9 4. What is the missing number?
34. 34.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 70 (c) 81 (d) 60
35. 35.9 × 9 =
36. 36.9 × 9 = 8? — what is the missing digit?
37. 37.56 × 4 =
38. 38.123456789 × 8 + 9 =
39. 39.9 × 2 =
40. 40.9 × 3 = 2? — what is the missing digit?

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