Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 103 · 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. 1.1 + 3 + 5 + … + 9 =
2. 2.A girl is 9 years old and her brother is 5 years older. How old will her brother be in 7 years?
3. 3.In 2 years a boy will be 10 years old. How old was he 2 years ago?
4. 4.Double 23 =
5. 5.Double 37 =
6. 6.Odd one out: which number is NOT in the 4 times table? (a) 12 (b) 23 (c) 28 (d) 20
7. 7.1 + 2 + 3 + … + 93 =
8. 8.Take 14 and take away the sum of its digits. What do you get?
9. 9.711 × ? = 7110
10. 10.96 × 10 =
11. 11.13 × 4 =
12. 12.37 × 3 =
13. 13.I thought of a number, added 1 and then doubled it. I got 40. What was my number?
14. 14.Magic square (every row, column and diagonal has the same total): 4 9 2 | 3 5 ? | 8 1 6. What is the missing number?
15. 15.7 × 9 =
16. 16.Odd one out: which number is NOT in the 4 times table? (a) 20 (b) 13 (c) 8 (d) 28
17. 17.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 79 (c) 81 (d) 82
18. 18.Double 91 =
19. 19.Take 44 and take away the sum of its digits. What do you get?
20. 20.Odd one out: which number is NOT in the 5 times table? (a) 15 (b) 31 (c) 25 (d) 10
21. 21.Do the 1089 trick with 921: reverse and subtract, then reverse that answer and add. What do you get?
22. 22.9 × 4 = ?6 — what is the missing digit?
23. 23.198 + 891 =
24. 24.9 × 4 = 3? — what is the missing digit?
25. 25.Do the 1089 trick with 810: reverse and subtract, then reverse that answer and add. What do you get?
26. 26.Think of 6. Multiply it by 5, then add 7. What number do you end with?
27. 27.I thought of a number, added 3 and then doubled it. I got 40. What was my number?
28. 28.22 × 4 =
29. 29.I thought of a number, added 8 and then doubled it. I got 26. What was my number?
30. 30.Magic square (every row, column and diagonal has the same total): ? 18 16 | 22 14 6 | 12 10 20. What is the missing number?
31. 31.34 × 4 =
32. 32.1 + 2 + 3 + … + 35 =
33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
34. 34.Magic square (every row, column and diagonal has the same total): 9 ? 5 | 4 8 12 | 11 6 7. What is the missing number?
35. 35.15 × 4 =
36. 36.9 × 5 = ?5 — what is the missing digit?
37. 37.1 + 2 + 3 + … + 91 =
38. 38.6?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.Take 23 and take away the sum of its digits. What do you get?
40. 40.12345679 × 9 =

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