Wednesday, February 20, 2013
This was the Do Now to get us started so we could talk about and learn more about a ratio. Some students said they had heard the word before but couldn't explain it. The Do Now fixed that :)
1.) Look at the picture and record the data
red - 5
green - 3
purple - 10
orange - 7
yellow - 6
I asked for people to make comments about what they noticed from the data. Right away a student said "there are more purple than any of the other colors." She hit the NAIL ON THE HEAD, I then asked what she had to do to come to this conclusion and another students said "she compared the purple to the other colors" YES YES YES.
This was a great way to start our lesson, I quickly said this comparison can be made into a ratio because that is exactly what a ratio is, a comparison of quantities. Together with the class we began comparing the numbers of each skittle.
Purple to Green
Yellow to Orange
All to Purple
Afterwards we looked at the 3 ways to write a ratio, you can use a colon, the word "to", or write the comparison as a fraction. For example, 1:3 or 1 to 3, or 1/3