Pre Algebra Periods 1, 2, & 4

Proportion Problems:
Remember it's all about the labels
Set up your problem first with your labels on either side!!

A lion has 12 heartbeats in 16 seconds. and h heartbeats in i minutes.

Oops, what do we need to do first?

Change the 1 minute into seconds so we are using the same labels!!

heartbeats/ seconds so 12/16 = h/60

Solve using cross products or 12(60) = 16h

Don't multiply out just yet. Get that variable alone first so divide both sides by 16

12(60)/16 = h Now simplify before you multiply--

That is, think what number goes into both 12 and 16?
4... so your equation becomes 3(60)/4 = h
but wait... you can simplify again because 4 goes into 60 -- how many times?
15 times.
So you get 3(15) = h or h = 45
You aren't done yet...
Your answer is 45 heartbeats.