Multiple LAN subnet with single gateway

[wasim.ahmed]

Hello,
Since this is routing related question, I am posting it here.

I have a subnet 10.0.0.0/24, which is divided as following subnets:
10.0.0.0/26 : 10.0.0.1-62
10.0.0.64/27: 10.0.0.65-94
10.0.0.96/27: 10.0.0.97-126
10.0.0.128/25: 10.0.0.129-254
Gateway: 10.0.0.1

All the networks are already on a single vlan. How can I point the 10.0.0.64/27, 10.0.0.96/27 and 10.0.0.128/25 subnet use 10.0.0.1 as the only gateway even though it is on 10.0.0.0/26 subnet? Dont really want to put them on separate vlan and create 3 extra interfaces on the pfsense.