Numbers to 20
In this unit students • count by ones and tens; • compare sets of objects; • count forward from a number other than one; • write numbers; • answer “how many?” questions about objects in varied arrangements.
Students further develop their understanding of numbers as they move beyond 10 to 20. They continue practice counting by ones and start counting by 10s. They count forward from a number other than one. They practice writing and recognizing the teen numbers before they work to understand those numbers as ten ones and more ones in the next unit. They also work with objects in various arrangements (lines, arrays, circles, and scattered) to count using a one-to-one correspondence. They learn that zero represents a count of no objects.
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