printing multiple photos from an ipad direct to air printer

Hello

I work as Tech support in primary school settings.

I always get asked about how educators can EASILY print multiple photos on one page to an air printer directly from a iPad. Does anyone know of any FREE apps that can help with this issue? They can only seem to print one photo on one page at a time....!

I know of Photo Print LT but that only allows 2 photos on a page then you have to pay for it...

Thanks