Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 217 · 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 × 4 =
2. 2.1 + 3 + 5 + … + 35 =
3. 3.A girl is 11 years old and her brother is 2 years older. How old will her brother be in 3 years?
4. 4.Magic trick! Think of 12. Double it, add 10, halve it, then take away 12. What number do you get?
5. 5.Think of 14. Multiply it by 5, then add 3. What number do you end with?
6. 6.Magic trick! Think of 6. Double it, add 6, halve it, then take away 6. What number do you get?
7. 7.9 × 3 =
8. 8.The ages of two twins add up to 14. How old is each twin?
9. 9.123456 × 9 + 7 =
10. 10.Magic square (every row, column and diagonal has the same total): 11 ? 9 | 10 12 14 | 15 8 13. What is the missing number?
11. 11.Magic square (every row, column and diagonal has the same total): 26 11 32 | 29 23 17 | 14 ? 20. What is the missing number?
12. 12.Take 28 and take away the sum of its digits. What do you get?
13. 13.Magic square (every row, column and diagonal has the same total): 11 32 17 | 26 20 14 | ? 8 29. What is the missing number?
14. 14.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
15. 15.Magic square (every row, column and diagonal has the same total): 9 2 7 | 4 ? 8 | 5 10 3. What is the missing number?
16. 16.Double 16 =
17. 17.Do the 1089 trick with 810: reverse and subtract, then reverse that answer and add. What do you get?
18. 18.Magic square (every row, column and diagonal has the same total): 16 26 ? | 14 18 22 | 24 10 20. What is the missing number?
19. 19.Take 33 and take away the sum of its digits. What do you get?
20. 20.32 × 4 =
21. 21.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
22. 22.297 + 792 =
23. 23.Odd one out: which number is NOT in the 8 times table? (a) 39 (b) 64 (c) 32 (d) 56
24. 24.29 × 4 =
25. 25.Take 411. Reverse its digits and take the smaller number away from the bigger one. What do you get?
26. 26.2 × ? = 2000
27. 27.1 + 3 + 5 + … + 25 =
28. 28.In 5 years a boy will be 14 years old. How old was he 6 years ago?
29. 29.Double 22 =
30. 30.Take 441. Reverse its digits and take the smaller number away from the bigger one. What do you get?
31. 31.1 + 3 + 5 + … + 39 =
32. 32.Take 30 and take away the sum of its digits. What do you get?
33. 33.9 × 5 = ?5 — what is the missing digit?
34. 34.If today is Wednesday, what day was it 35 days ago? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
35. 35.5 × 9 =
36. 36.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
37. 37.Double 48 =
38. 38.56 × 4 =
39. 39.11111 × 11111 =
40. 40.1 + 3 + 5 + … + 23 =

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