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\ 10-Nov-2025 Bharat Arora Proof-8 Reader’s Sign _______________________ Date __________

Fun Activity 21 st
Century
Skills #Computational Thinking

1. Find the mystery number.

a. Take any 3-digit number where all the digits are different.
b. Write the number in reverse order.

c. Subtract the smaller number from the larger one.
d. Reverse the result.

e. Add the results obtained in steps (c) and (d).
Did you get 1089?

2. Start from Box A and reach Box L by finding the best way through the maze.

StARt

7908 15144 6558

7564 19130
7918 15244 14144 18130 18518

7864 1144 19030

8864 8564 1044 17748 3118 18030 3318

7558 17848 3218

FiNiSh

42 Mathematics 4