Welcome to our lesson on decomposing teen numbers. Today we will learn how to break down numbers like thirteen into ten plus three. This helps us understand numbers better by seeing them as groups of ten and some ones.
Now let's learn the steps to decompose teen numbers. We start with fifteen blocks. First, we count out ten blocks and color them red. Then we count the remaining blocks and color them green. This shows us that fifteen equals ten plus five.
Let's practice with more examples. Here we have twelve, which equals ten plus two. Next is sixteen, which equals ten plus six. Finally, nineteen equals ten plus nine. Notice how every teen number can be broken down into ten plus some ones.
Now it's your turn to try! Look at this number seventeen. Can you decompose it? Think about it for a moment. Count out ten blocks first, then count the remaining ones. The answer is seventeen equals ten plus seven. Great job!