Hello Shamal
Yes absolutely. We can go through this together. The process is essentially the same. Let’s represent the first two octets in decimal and only the second two octets in binary to save space:
192.11.00000000.00000000
192.11.00000001.00000000
192.11.00000010.00000000
192.11.00000011.00000000
As you can see, in the third octet the first six bits are the same, and the seventh bit changes, so that means that the summary prefix that should be used is /22 (22 bits counting from the left). This is the same as a subnet mask of 255.255.252.0.
So the network address would be 192.11.00000000.00000000 which in decimal is 192.168.0.0. So the summary address is 192.168.0.0/22.
Now because the masks are different, you just have to confirm that the ranges in all of your networks are found within the summary range. If you examine the actual IP address ranges, you will see that all of them are included in the summary.
Eventually, if you do enough of these exercises, you will be able to calculate these summary addresses in your mind with relatively good accuracy.
I hope this has been helpful!
Laz