In To Market, To Market, kids visit a series of stands at an open-air market with a carnival atmosphere. They work with 'big' numbers right away, expanding on their ability to compare and make equal. Gradually, numerals are introduced.
Whimsical hosts give helps and hints along the way.
Ms. Butterfly's stand invities children to compare sets of objects and tell which has more. In level one, objects can be compared visually. In level two and three, the quantities are close enough that grouping is necessary in order to compare. Sound is also used to help compare quantity. However, this stand is more difficult and does require children to think and problem solve.