Endless Numbers

The creators of Endless Alphabet and Endless Reader turn their talents to the realm of numbers.  This app sneakily teaches so many different math concepts (counting by ones, twos, threes; addition; place value, etc.) and yet it's simple enough for a preschooler to navigate without problems. Each number features a short, humorous animation to illustrate the quantity, which kids will want to watch over and over.  The free version gives users access to numbers 1-5 and then in-app purchases give you the opportunity to expand all the way to 100.