Tricky Teens

Now that we’re moving into spring, I wanted to be sure my kindergarteners were beginning to gain a foundation for place value before moving onto first grade. The Common Core State Standards for Mathematics (CCSS-M) expect students to “compose and decompose numbers 11 to 19 into tens and ones.”  We know that seeing teen numbers in terms of tens and ones helps kids build number sense for place value in our base-ten system. My string encouraged this sort of grouping by utilizing ten frames. As is our ritual, I quickly show the images, one at a time, and I ask my kids:

            How many dots did you see?

            How did you see them?

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