About this video
This video solves a subtraction word problem: 10 sharks were at the reef and 2 swam away. Taking away 2 from 10 leaves 8 sharks, so 10 - 2 = 8.
You'll be able to
- tell when a word problem means take away.
- solve 10 - 2 by taking away and counting what is left.
Key words
- left
- How many are still there after some go away.
- minus
- The word for the - sign, which means take away.
Transcript
- [Voiceover] There were 10 sharks at the reef. And we see, there's one, two, three, four, five, six, seven, eight, nine, 10 sharks, just like they told us. Two sharks swam away, I was gonna say ran away, (laughs), they swam away. How many sharks are left? So, let's think about it.
There were 10 sharks at the reef and two of them, two of them, swam away, so how many sharks are left? How many sharks are left? Well, what's 10 minus two going to be equal to? Well, we could look up here if we had 10 pictures of sharks and we were to take away, we were to take away one and then two, how many are going to be left?
Well, we see we have one, two, three, four, five, six, seven, and eight. So, 10 minus two, 10 taking away two sharks, the two sharks that swam away, is going to be equal to eight.
Video © Khan Academy, used under CC BY-NC-SA. Watch on Khan Academy. Puzzicle is not affiliated with Khan Academy.