This looks like VLSM exercise. My approach is based on blocks of IPs or subnets/networks. I would recommend using Magic table and decimal (not binary way) since it is faster and more convenient (no need to convert number to binary values then back to decimal. But, of course use whatever u feel best and works for you.
So, VLSM, I would start with the larger number of hosts; assign block or subnet with /x. then take next avaiable blcok of /x and divide it into next smaller number of hosts , aka /y . keep going down towards smaller one ending on /30.
Yes, I would also recommend test it your work with subnet calculator or in PT assigning IPs to devices
Regards, ML
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