Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 569 · 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 × 2 = ?8 — what is the missing digit?
2. 2.Magic square (every row, column and diagonal has the same total): 9 ? 17 | 19 11 3 | 5 15 13. What is the missing number?
3. 3.123 × 8 + 3 =
4. 4.A girl is 8 years old and her brother is 6 years older. How old will her brother be in 2 years?
5. 5.1 + 2 + 3 + … + 89 =
6. 6.Double 21 =
7. 7.7?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
9. 9.413? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.12 × 4 =
11. 11.1 + 2 + 3 + … + 80 =
12. 12.22 × 4 =
13. 13.Take 17 and take away the sum of its digits. What do you get?
14. 14.Take 875. Reverse its digits and take the smaller number away from the bigger one. What do you get?
15. 15.1 + 3 + 5 + … + 41 =
16. 16.If today is Sunday, what day will it be after 9 days? (a) Tuesday (b) Friday (c) Monday (d) Wednesday
17. 17.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
18. 18.27 × 1000 =
19. 19.37 × 4 =
20. 20.90 × 100 =
21. 21.9 × 6 = 5? — what is the missing digit?
22. 22.9 × 2 = 1? — what is the missing digit?
23. 23.Take 29 and take away the sum of its digits. What do you get?
24. 24.57 × ? = 5700
25. 25.1 + 2 + 3 + … + 57 =
26. 26.19 × 4 =
27. 27.670 × ? = 6700
28. 28.1 + 2 + 3 + … + 79 =
29. 29.Take 40 and take away the sum of its digits. What do you get?
30. 30.46 × 4 =
31. 31.1 + 3 + 5 + … + 17 =
32. 32.Take 872. Reverse its digits and take the smaller number away from the bigger one. What do you get?
33. 33.240 × 10 =
34. 34.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹9. How many ₹2 coins do you have?
35. 35.In 5 years a boy will be 17 years old. How old was he 2 years ago?
36. 36.36 × 100 =
37. 37.1 + 2 + 3 + … + 34 =
38. 38.33 × 4 =
39. 39.12345679 × 72 =
40. 40.9 × 9 =

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