Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 764 · 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.I thought of a number, added 7 and then doubled it. I got 50. What was my number?
2. 2.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
3. 3.31 × 4 =
4. 4.20 × 4 =
5. 5.9 × 4 =
6. 6.Magic square (every row, column and diagonal has the same total): ? 10 15 | 16 12 8 | 9 14 13. What is the missing number?
7. 7.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 42 (c) 49 (d) 48
8. 8.11 × 11 =
9. 9.Magic square (every row, column and diagonal has the same total): 14 12 22 | 24 16 8 | ? 20 18. What is the missing number?
10. 10.12345679 × 72 =
11. 11.123 × 9 + 4 =
12. 12.1 + 2 + 3 + … + 37 =
13. 13.Take 21 and take away the sum of its digits. What do you get?
14. 14.9 × 8 = 7? — what is the missing digit?
15. 15.9 × 4 = ?6 — what is the missing digit?
16. 16.198 + 891 =
17. 17.I thought of a number, multiplied it by 2 and added 7. I got 25. What was my number?
18. 18.21 × 1000 =
19. 19.In 4 years a boy will be 16 years old. How old was he 3 years ago?
20. 20.22 × 100 =
21. 21.I thought of a number, multiplied it by 2 and added 2. I got 26. What was my number?
22. 22.Take 64 and take away the sum of its digits. What do you get?
23. 23.I thought of a number, multiplied it by 2 and added 8. I got 20. What was my number?
24. 24.825 × ? = 8250
25. 25.133 × ? = 1330
26. 26.The ages of two twins add up to 20. How old is each twin?
27. 27.A girl is 11 years old and her brother is 6 years older. How old will her brother be in 9 years?
28. 28.?481 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.9 × 4 = 3? — what is the missing digit?
30. 30.134 × ? = 1340
31. 31.Half of 52 =
32. 32.In 2 years a boy will be 11 years old. How old was he 4 years ago?
33. 33.Magic square (every row, column and diagonal has the same total): 11 21 7 | 9 13 17 | 19 ? 15. What is the missing number?
34. 34.9 × 8 =
35. 35.9 × 6 = 5? — what is the missing digit?
36. 36.11 × ? = 11000
37. 37.1234 × 9 + 5 =
38. 38.Do the 1089 trick with 673: reverse and subtract, then reverse that answer and add. What do you get?
39. 39.Half of 112 =
40. 40.46 × 4 =

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