Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 690 · 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.A girl is 9 years old and her brother is 2 years older. How old will her brother be in 9 years?
2. 2.Magic trick! Think of 6. Double it, add 6, halve it, then take away 6. What number do you get?
3. 3.12345679 × 45 =
4. 4.What comes next? 4, 10, 16, 22, ? (a) 22 (b) 28 (c) 29 (d) 34
5. 5.5?08 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.Magic trick! Think of 5. Double it, add 10, halve it, then take away 5. What number do you get?
7. 7.99 × ? = 990
8. 8.A girl is 10 years old and her brother is 2 years older. How old will her brother be in 3 years?
9. 9.Magic square (every row, column and diagonal has the same total): 6 16 14 | 20 12 4 | 10 ? 18. What is the missing number?
10. 10.Magic square (every row, column and diagonal has the same total): 9 10 5 | 4 8 12 | 11 6 ?. What is the missing number?
11. 11.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹16. How many ₹2 coins do you have?
12. 12.1 + 2 + 3 + … + 83 =
13. 13.8?47 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
14. 14.What comes next? 6, 9, 12, 15, ? (a) 15 (b) 21 (c) 19 (d) 18
15. 15.9 × 7 =
16. 16.Do the 1089 trick with 149: reverse and subtract, then reverse that answer and add. What do you get?
17. 17.40 × 4 =
18. 18.Magic square (every row, column and diagonal has the same total): ? 10 25 | 28 16 4 | 7 22 19. What is the missing number?
19. 19.Take 134. Reverse its digits and take the smaller number away from the bigger one. What do you get?
20. 20.If today is Sunday, what day was it 10 days ago? (a) Friday (b) Sunday (c) Wednesday (d) Thursday
21. 21.1 + 2 + 3 + … + 36 =
22. 22.29 × 1000 =
23. 23.9 × 8 = ?2 — what is the missing digit?
24. 24.Magic square (every row, column and diagonal has the same total): 17 14 29 | 32 ? 8 | 11 26 23. What is the missing number?
25. 25.42 × 1000 =
26. 26.1 + 2 + 3 + … + 89 =
27. 27.Double 42 =
28. 28.12 × 8 + 2 =
29. 29.?055 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.The 3rd of a month is a Sunday. What day is the 19th of the same month? (a) Monday (b) Tuesday (c) Wednesday (d) Friday
31. 31.Double 49 =
32. 32.9 × 5 =
33. 33.If today is Monday, what day will it be after 34 days? (a) Sunday (b) Saturday (c) Monday (d) Wednesday
34. 34.Take 298. Reverse its digits and take the smaller number away from the bigger one. What do you get?
35. 35.Magic square (every row, column and diagonal has the same total): ? 6 27 | 24 18 12 | 9 30 15. What is the missing number?
36. 36.Magic square (every row, column and diagonal has the same total): 14 11 26 | ? 17 5 | 8 23 20. What is the missing number?
37. 37.A girl is 5 years old and her brother is 4 years older. How old will her brother be in 4 years?
38. 38.Think of 14. Multiply it by 5, then add 2. What number do you end with?
39. 39.A father is 31 years old and his son is 8. How old was the father when the son was born?
40. 40.?876 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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