In a new study children who had not yet received arithmetic instruction, but had mastered verbal counting, were able to perform symbolic addition and subtraction, provided that only approximate ...

Create your own centimeter ruler. Then, estimate and measure with lengths with it. Warm up with a Mystery Math Mistake as you add two 2-digit numbers using a decomposition strategy. Think through ...

Children are able to solve approximate addition or subtraction problems involving large numbers even before they have been taught arithmetic, according to a study conducted at Harvard University, by ...