Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 631 · 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. 1.3 × 9 =
2. 2.9 × 9 = 8? — what is the missing digit?
3. 3.5 × 9 =
4. 4.In 5 years a boy will be 15 years old. How old was he 7 years ago?
5. 5.If today is Monday, what day was it 32 days ago? (a) Friday (b) Wednesday (c) Sunday (d) Thursday
6. 6.51 × 4 =
7. 7.6 × 4 =
8. 8.705 × 10 =
9. 9.The ages of two twins add up to 28. How old is each twin?
10. 10.Magic trick! Think of 17. Double it, add 8, halve it, then take away 17. What number do you get?
11. 11.891 + 198 =
12. 12.9 × 8 = 7? — what is the missing digit?
13. 13.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
14. 14.71 × ? = 7100
15. 15.Half of 144 =
16. 16.Think of 5. Multiply it by 5, then add 3. What number do you end with?
17. 17.9 × 7 = ?3 — what is the missing digit?
18. 18.1 + 2 + 3 + … + 56 =
19. 19.1 + 2 + 3 + … + 96 =
20. 20.7 × 4 =
21. 21.111111 × 111111 =
22. 22.Magic trick! Think of 7. Double it, add 10, halve it, then take away 7. What number do you get?
23. 23.Magic square (every row, column and diagonal has the same total): ? 11 6 | 5 9 13 | 12 7 8. What is the missing number?
24. 24.1 + 2 + 3 + … + 87 =
25. 25.495 + 594 =
26. 26.9 × 9 =
27. 27.Double 87 =
28. 28.1 + 2 + 3 + … + 15 =
29. 29.Magic square (every row, column and diagonal has the same total): 8 6 16 | 18 10 ? | 4 14 12. What is the missing number?
30. 30.A girl is 12 years old and her brother is 3 years older. How old will her brother be in 3 years?
31. 31.353 × 10 =
32. 32.12345679 × 72 =
33. 33.9 × 8 = ?2 — what is the missing digit?
34. 34.33 × 4 =
35. 35.37 × 27 =
36. 36.Odd one out: which number is NOT in the 8 times table? (a) 16 (b) 58 (c) 40 (d) 64
37. 37.15 × 4 =
38. 38.Magic square (every row, column and diagonal has the same total): 11 16 15 | 18 14 ? | 13 12 17. What is the missing number?
39. 39.Magic square (every row, column and diagonal has the same total): 28 7 ? | 13 19 25 | 16 31 10. What is the missing number?
40. 40.Take 217. Reverse its digits and take the smaller number away from the bigger one. What do you get?

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