Exercise 7 Page 13

We want to find how many words Ben can type in 10 minutes. To do so, we will find the unit rate, which is his average typing speed, and multiply it by 10 minutes. We know that Ben can type 153 words in 3 minutes. Let's write a rate to show this situation. 153 words/3minutes A unit rate is a rate that has been reduced to a denominator of 1 unit. In this case, the unit rate is the number of words per minute typed by Ben, which is his average typing speed. Let's find the unit rate! For simplicity, we will ignore the units.

153/3

ReduceFrac

a/b=.a / 3./.b / 3.

153/ 3/3/ 3

SimpQuot

Simplify quotient

51/1

We found the unit rate! 153 words/3minutes =51 words/1minute As we can see, Ben's typing speed is 51 words per minute. Now we can multiply the unit rate by 10 minutes. 51 words/1 minute * 10 minutes = 51 words * 10 = 510 words Ben can type 510 words in 10 minutes.