Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 687 · 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. 1.9 × 10 =
2. 2.Do the 1089 trick with 270: reverse and subtract, then reverse that answer and add. What do you get?
3. 3.Odd one out: which number is NOT in the 9 times table? (a) 36 (b) 54 (c) 18 (d) 46
4. 4.Double 73 =
5. 5.Magic square (every row, column and diagonal has the same total): ? 7 2 | 1 5 9 | 8 3 4. What is the missing number?
6. 6.1234 × 8 + 4 =
7. 7.24 × 4 =
8. 8.A girl is 5 years old and her brother is 6 years older. How old will her brother be in 8 years?
9. 9.108? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.Take 940. Reverse its digits and take the smaller number away from the bigger one. What do you get?
11. 11.Magic square (every row, column and diagonal has the same total): 16 9 14 | 11 ? 15 | 12 17 10. What is the missing number?
12. 12.Magic square (every row, column and diagonal has the same total): 20 17 32 | ? 23 11 | 14 29 26. What is the missing number?
13. 13.123 × 9 + 4 =
14. 14.12 × 1000 =
15. 15.1 + 3 + 5 + … + 29 =
16. 16.12345678 × 8 + 8 =
17. 17.If today is Monday, what day was it 56 days ago? (a) Thursday (b) Sunday (c) Monday (d) Tuesday
18. 18.Magic square (every row, column and diagonal has the same total): 8 3 10 | 9 7 5 | 4 ? 6. What is the missing number?
19. 19.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 25 (c) 23 (d) 26
20. 20.37 × 27 =
21. 21.Double 38 =
22. 22.9 × 5 = ?5 — what is the missing digit?
23. 23.Half of 132 =
24. 24.37 × 21 =
25. 25.57 × 4 =
26. 26.9 × 9 =
27. 27.Do the 1089 trick with 268: reverse and subtract, then reverse that answer and add. What do you get?
28. 28.375? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.11111 × 11111 =
30. 30.Odd one out: which number is NOT in the 8 times table? (a) 56 (b) 32 (c) 24 (d) 41
31. 31.9 × 3 = 2? — what is the missing digit?
32. 32.912 × ? = 9120
33. 33.Take 76 and take away the sum of its digits. What do you get?
34. 34.1 + 2 + 3 + … + 75 =
35. 35.1 + 2 + 3 + … + 20 =
36. 36.1 + 2 + 3 + … + 40 =
37. 37.38 × 4 =
38. 38.9 × 3 = ?7 — what is the missing digit?
39. 39.Magic square (every row, column and diagonal has the same total): 16 6 20 | 18 14 10 | 8 22 ?. What is the missing number?
40. 40.54 × 4 =

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