Ratio.

Class 5-5 learned all about ratios today.
I adopted an unusual way of teaching today. It was an eating lesson!

Pupils were divided into 10 groups and each group was given a pack of chocolates.
They are asked to open them and pour out the contents of the chocolates.
Red, brown, yellow, green chocolates were all over their tables and they were asked to make a list of how many they have.

Turns out that some packets have 9 while the others have 8. Hmmmm... something wrong with the chocolate-maker factory?

Then, I asked a question. What is the ratio of red chocolates to green chocolates. I was glad that each group was quick to provide me an answer. This shows that they have grasped the concept of ratio!

Some more ratio concepts that class 5-5 should know,
1) There is no need to write units for ratios.
2) The ratio has to be respectively represented as asked by the question. This means that if the question asked ratio of boys is to girls in class 5-5, one would have to write the answer as 21 : 20 and not 20 : 21.
3) Ratio, similar to fractions are to be converted to the simplest form.

I was glad that the lesson went well and I hope that students have enjoyed and learned or at least grasp the concepts of ratios today.

*Oh, what about the chocolates? Students ate them all of course!" I was lucky to have one piece. Yum Yum.*

Mr Xie.