A hallmark of accurate counting is when preschoolers begin to assign one number, and only one number, to each object as they count. We see this achievement when a child touches or tags each object in time with saying the counting words....

We see numbers everywhere around us - measuring the temperature, counting money, telling the time, etc. The numbers that are used for counting objects are called "natural numbers". This article explains the properties of natural numbers...

This article discusses what grammar first graders need to know including how to count out syllables by clapping, what nouns and verbs are and the differences between them, and basic sentence structure (subject-verb-object).