Rates of Change (:in maths:)

Rates of Change is a maths strategy including fractions and whole numbers. To successfully do Rates of Change, the problem has to be a problem when you divide a number by fractions. This is an example: What is 3/4 (or three-quarters) of 18? Rates of change will make this problem easier. I will show you one way of doing rates of change, which i am going to do it in a table form: 

Dollars	IceBlocks
$20	12
$8	___

For this example i am going to include iceblocks. Lets say I have $20 and i can get 12 iceblocks with that amount of money, and i want to figure out how many iceblocks i would get if i had $8. To figure it out i will divide 20 and 12. 20 divided by 5 equals 4 and 12 divided by 4 equals 3. 4 is a half of 8 so if i do 2 times 4 i need to do 2 times 3 which is 6, so the answer is 6 iceblocks.