Can i connect 2 solderless breadboards together with jumper wire?

[physicsman20]

i am running out of room on my current breadboard and the only breadboard i can find in my city is the same size as mine. if i can connect them do i need two voltage regulators or one? I am currently using a 9v battery on my old breadboard.

 

[TVP45]

Sure you can string breadboards together so long as you pay attention to buses. Whether you need another voltage regulator depends on the current draw. Only you know that.