Since Francis used 315 forks out of 450 forks, we can set up a fraction like 315/450
We then want to simplify this fraction to get a percentage.
We can divide the top and bottom by 45, which is will give us a simplified fraction of 7/10, which is equal to the percent of 70%
Work to write: 315/450 = 7/10 = 0.7 = 70%
