What is the importance of having a standard method of measurement such as the SI system?
see answer below
Having a standerd unit or standard method of measurement is important when you are computing equations in any subject in math, physics, or chemisty.
Lets take for example if you are going to the store and you are asked to get two 5 pounds bags of salami, how many kilos of salami do you have?
The answer is not 5 times 2 bags. due to the fact that there are two different types of units.
When you are answering a question in class, don't forget to convert all your units to one measurement.