makes every

• fraction
• ratio
• test
• growth rate or decline
• tax or fine

out of 100

common ones

• 1/2, .5, 50%
• 1/4, .25, 25%
• 1/5, .20, 20%
• 1/10, .1, 10%

algorithm

• you got 8/10 on a quiz
• what is the %?
• 8 divided by 10= .8
• .8 x 100 = 80

What happens when it's not base 10?
12/15 eggs hatched
what percentage hatched?

Now lets work backwards
a mean of 14% of the
puppies are black & white
a litter contained 12 pups
how many will be b & w?