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Video: Multiplying Integer Numbers in Word Problems

Kathryn Kingham

The average person loses 50 to 80 hairs per day. If a person lost 63 hairs per day for 10 days without regrowing any, what would be the change in the number of hairs that person has?

01:33

Video Transcript

The average person loses fifty to eighty hairs per day. If a person lost sixty-three hairs per day for ten days without regrowing any hair, what would be the change in the number of hairs that person has?

Well, here’s our person who’s lost sixty-three hairs per day for the last ten days. Let’s help her figure out the change in the number of hairs she has. We know that she’s losing sixty-three hairs per day and then that has happened for ten days. We’re looking for the change in the number of hairs. We’ll start off by figuring out what’s sixty-three times ten equals.

Sixty-three times ten equals six hundred and thirty. Our person has lost six hundred and thirty hairs.

But is there a way that we can represent her losing her hairs with a different integer? We could choose to represent the hair loss by using a negative. The change in our person’s number of hairs is in the negative direction; it’s losing something. Negative six hundred and thirty hairs would represent the change in the number of hairs that person has.