Cannot ping from one room to another (Packet Tracer)

[tp068713]

Hello, so as you can see, I am able to ping from one device to another as long as they are within the same room/have the same NWID. I am a beginner at setting these network diagrams up and I was sure I followed all of my teacher's instructions. Is there a reason why I am unable from ping from one room to the next? 

Please do let me know which amendments I have to make.

[Kasun Bandara]

make sure you enabled routing in connected main router

then configure related default gateway properly in PCs in each network

[tp068713]

Hello, 

This should mean that I've already enabled routing, right? I already had it on last night, which is why I was confused why it wouldn't work. Could you please tell me if there's a way to fix it?

[Georg Pauwen]

Hello,

post the zipped Packet Tracer project (.pkt) file...

[tp068713]

Here, thank you so much!