Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 763 · 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. 1.1 + 2 + 3 + … + 16 =
2. 2.A father is 33 years old and his son is 5. How old was the father when the son was born?
3. 3.11111 × 11111 =
4. 4.929 × ? = 9290
5. 5.788? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.I thought of a number, added 3 and then doubled it. I got 26. What was my number?
7. 7.Magic square (every row, column and diagonal has the same total): 16 31 10 | 13 19 ? | 28 7 22. What is the missing number?
8. 8.Double 77 =
9. 9.12345679 × 54 =
10. 10.A girl is 7 years old and her brother is 5 years older. How old will her brother be in 3 years?
11. 11.1 + 3 + 5 + … + 33 =
12. 12.Magic square (every row, column and diagonal has the same total): 22 8 18 | 12 16 20 | ? 24 10. What is the missing number?
13. 13.In 2 years a boy will be 11 years old. How old was he 7 years ago?
14. 14.9 × 9 =
15. 15.Take 62 and take away the sum of its digits. What do you get?
16. 16.1 + 2 + 3 + … + 93 =
17. 17.58?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
19. 19.1 + 2 + 3 + … + 74 =
20. 20.A father is 35 years old and his son is 10. How old was the father when the son was born?
21. 21.Take 97 and take away the sum of its digits. What do you get?
22. 22.Do the 1089 trick with 107: reverse and subtract, then reverse that answer and add. What do you get?
23. 23.42 × ? = 42000
24. 24.9 × 4 = ?6 — what is the missing digit?
25. 25.1 + 2 + 3 + … + 25 =
26. 26.76 × 100 =
27. 27.699 × 10 =
28. 28.37 × 15 =
29. 29.1 + 2 + 3 + … + 7 =
30. 30.28 × 1000 =
31. 31.Double 98 =
32. 32.36 × 4 =
33. 33.3 × 1000 =
34. 34.472 × ? = 4720
35. 35.4 × 9 =
36. 36.9 × 10 = ?0 — what is the missing digit?
37. 37.Take 900. Reverse its digits and take the smaller number away from the bigger one. What do you get?
38. 38.A father is 36 years old and his son is 14. How old was the father when the son was born?
39. 39.Magic square (every row, column and diagonal has the same total): 6 11 10 | 13 ? 5 | 8 7 12. What is the missing number?
40. 40.19 × 4 =

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