Make ten

Let's add

Let's add nine plus four. There are nine dots in the box. There are four yellow dots beside it.

One empty space

Look at the empty space. This box holds ten dots. Nine dots need one more to make ten.

Move one dot

Move one yellow dot into the empty space. Nine plus one is ten. The box is full!

Three dots left

Three yellow dots are left beside the box. Ten in the box, plus three more. Ten plus three is thirteen.

We have thirteen!

We still have all the same dots. We just moved one. Nine plus four is thirteen!

Your turn

Let's try eight plus five. Pause here. How many dots will fill the empty spaces?

Make ten again

Eight needs two more dots. Move two yellow dots into the box. Now we have ten, with three dots left. Eight plus five is thirteen!