Jumping in with both feet

Hey guys- today was a busy busy day. We finished up everything from Semester 1 and we jumped right back in for semester 2. Today we started talking about rates and ratios. Most of it is very simple. A ratio is a comparison of two quantities by division. A rate is a comparison of two quantities with unlike units (miles/ hour) The hard part is when we have to switch units.

For example, 18 minutes/ 2 gallons to hours/ quarts.

18 minutes times 1 hour times 1 gallon
2 gallons 60 minutes 4 quarts

You can cancel minutes with minutes and gallons with gallons, leaving 18/2 x 1 hour/ 60 x 1/ 4 quarts. Multiply across the top to get 18x1x1= 18 hours. Across the bottom we have 2 x 60 x 4 qts= 480 quarts. So 18 hours/ 480 quarts, which can simplify to 3 hours/ 80 quarts.

We'll go over this in class tomorrow, so no sweat if you didn't get it the first time!

Homework is 6-1 worksheet.

DOn't spend forever on it- do what you can in a reasonable amount of time.

Thanks
Ms V