Question Video: Subtracting From Teen Numbers by Decomposing to Make a Ten Mathematics • 1st Grade

Video Transcript

Let us try to find 13 take away nine.

We can draw 13 dots as one group of 10 and one group of three dots. 13 is equal to 10 plus three. Now take away nine from the group of 10 dots. 10 take away nine, three. We are left with one plus three dots, which is four dots. So 13 take away nine equals four.

Now you have a go. What is 12 take away nine?

12 is equal to 10 plus two. We have to take away nine. One, two, three, four, five, six, seven, eight, nine. There’s one dot left here. And there are two dots here. There are three dots left altogether. 12 take away nine equals three.