First graders began a new unit in math this week focued on developing an understanding of place value for numbers up to 99. Focused on the structure of numbers in base ten, unit activities allow mathematicians to see that the two digits of a two-digit number represent how many tens and ones there are. Exposure and experience with unitizing, a critical first grade skill, is also being developed as they learn that 10 ones make a unit called a "ten" and that quantities from 11 to 99 are composed of some number tens and ones. Unitizing allows for counting larger quantities more accurately and efficiently as well as sets the scene for double digit addition.
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