Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 674 · 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 10 years old and her brother is 6 years older. How old will her brother be in 9 years?
2. 2.A piggy bank has 8 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
3. 3.Do the 1089 trick with 990: reverse and subtract, then reverse that answer and add. What do you get?
4. 4.12345679 × 36 =
5. 5.9 × 6 = 5? — what is the missing digit?
6. 6.9 × 4 =
7. 7.48 × 4 =
8. 8.Do the 1089 trick with 500: reverse and subtract, then reverse that answer and add. What do you get?
9. 9.11 × 11 =
10. 10.Take 701. Reverse its digits and take the smaller number away from the bigger one. What do you get?
11. 11.53 × 4 =
12. 12.1 + 2 + 3 + … + 43 =
13. 13.If today is Tuesday, what day will it be after 35 days? (a) Wednesday (b) Friday (c) Monday (d) Tuesday
14. 14.6 × 4 =
15. 15.1 + 3 + 5 + … + 31 =
16. 16.44 × ? = 44000
17. 17.9 × 5 = ?5 — what is the missing digit?
18. 18.Take 61 and take away the sum of its digits. What do you get?
19. 19.The 2nd of a month is a Monday. What day is the 15th of the same month? (a) Saturday (b) Wednesday (c) Monday (d) Sunday
20. 20.What comes next? 2, 6, 10, 14, ? (a) 22 (b) 19 (c) 18 (d) 14
21. 21.If today is Saturday, what day was it 9 days ago? (a) Thursday (b) Friday (c) Wednesday (d) Sunday
22. 22.Magic trick! Think of 20. Double it, add 4, halve it, then take away 20. What number do you get?
23. 23.9 × 6 =
24. 24.9 × 7 = 6? — what is the missing digit?
25. 25.1 + 3 + 5 + … + 27 =
26. 26.Take 62 and take away the sum of its digits. What do you get?
27. 27.Magic trick! Think of 20. Double it, add 16, halve it, then take away 20. What number do you get?
28. 28.9 × 10 =
29. 29.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹9. How many ₹2 coins do you have?
30. 30.1111 × 1111 =
31. 31.Half of 168 =
32. 32.111111 × 111111 =
33. 33.I thought of a number, multiplied it by 3 and added 4. I got 28. What was my number?
34. 34.I thought of a number, multiplied it by 5 and added 7. I got 22. What was my number?
35. 35.2?85 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.9 × 8 = 7? — what is the missing digit?
37. 37.319 × 10 =
38. 38.107? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.9 × 7 =
40. 40.What comes next? 10, 16, 22, 28, ? (a) 28 (b) 40 (c) 34 (d) 35

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