First, part the hair down the middle & make 2 half pony-tails. After you have put the rubberbands in, then braid it down.
Keep parting the hair down the middle. Make your next set of ponies, but criss-cross your braids into them. Take out the rubberband that was holding the braid.
Rebraid those ponies.
Part down the middle one last time & make your last set of ponies, remember to criss-cross the braids & add them to your last ponies.