to write a ratio, we can do ?:? in order. for example, 5 big shops to 10 small shops would be 5:10 (we are going to simplify it later) You always have to put the ratio numbers in order like they are in the question. In this case, small bones : big bones. We get 9:6. We can then divide both sides by a common factor, in this case 3. The end result is 3:2. Hope this helps!
Irrational numbers are numbers that can not be written as a simple fraction. An example of one would be . Pi is about 3.14, but it goes on forever. You can not write pi as a simple fraction.