If you're like many people, you find it hard to quickly come up with the proper tip amount when you are figuring out your portion of the bill for your meal. In some cases, you are paying for the whole thing and just don't know how much to add for the tip. In others, you're part of a group and need to determine your share. Whatever the scenario, you're sure to find a suitable app among our list of the best iPad apps for tipping.