Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 580 · 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.Magic square (every row, column and diagonal has the same total): 9 8 13 | 14 10 6 | 7 ? 11. What is the missing number?
2. 2.9 × 2 = 1? — what is the missing digit?
3. 3.Double 24 =
4. 4.Magic square (every row, column and diagonal has the same total): 16 6 8 | 2 10 ? | 12 14 4. What is the missing number?
5. 5.Magic trick! Think of 14. Double it, add 6, halve it, then take away 14. What number do you get?
6. 6.Double 15 =
7. 7.9 × 4 = ?6 — what is the missing digit?
8. 8.Magic trick! Think of 16. Double it, add 6, halve it, then take away 16. What number do you get?
9. 9.Half of 138 =
10. 10.Double 71 =
11. 11.Odd one out: which number is NOT in the 4 times table? (a) 20 (b) 14 (c) 32 (d) 12
12. 12.169? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.1 + 2 + 3 + … + 61 =
14. 14.95 × 10 =
15. 15.Take 17 and take away the sum of its digits. What do you get?
16. 16.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
17. 17.891 + 198 =
18. 18.1 + 3 + 5 + … + 11 =
19. 19.37 × 21 =
20. 20.45 × 4 =
21. 21.Magic square (every row, column and diagonal has the same total): 30 ? 18 | 9 21 33 | 24 27 12. What is the missing number?
22. 22.Half of 174 =
23. 23.Magic square (every row, column and diagonal has the same total): 12 14 4 | ? 10 18 | 16 6 8. What is the missing number?
24. 24.1 + 2 + 3 + … + 24 =
25. 25.A father is 32 years old and his son is 11. How old was the father when the son was born?
26. 26.Take 751. Reverse its digits and take the smaller number away from the bigger one. What do you get?
27. 27.The ages of two twins add up to 18. How old is each twin?
28. 28.10 × 9 =
29. 29.9 × 7 =
30. 30.9 × 3 = 2? — what is the missing digit?
31. 31.2 × 9 =
32. 32.66?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.Magic square (every row, column and diagonal has the same total): 7 22 19 | 28 16 4 | 13 10 ?. What is the missing number?
34. 34.Magic square (every row, column and diagonal has the same total): 13 18 ? | 12 14 16 | 17 10 15. What is the missing number?
35. 35.363 × ? = 3630
36. 36.Magic square (every row, column and diagonal has the same total): 15 30 27 | 36 24 12 | 21 ? 33. What is the missing number?
37. 37.9 × 5 = ?5 — what is the missing digit?
38. 38.9 × 9 = 8? — what is the missing digit?
39. 39.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 79 (c) 82 (d) 81
40. 40.9 × 4 =

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