Add within 20 by Bridging 10

Let's add eight plus five. When the answer goes past ten, we can use a clever trick called make-a-ten.

Here's a number line. We'll start at eight and hop our way to the answer.

First, put a dot at eight. That's where we begin.

How many more do we need to add to eight to reach ten?

Two! Eight plus two equals ten. Hop forward two.

We used two of our five. So five splits into two and three.

Now add the three that's left. Ten plus three is thirteen. Hop forward three.

Eight plus five is thirteen. Make-a-ten makes adding easy!