B= stand for Brackets ( )
E= stand for Exponents
D= stand for Division (In order form left to right)
M= stand for Multiplication
A= Stand for Addition (In order from left to right) and
S= stand for Subtraction.
Division and Multiplication goes left to right and if you see the first number you divide it and after that you multiply it.
Example:

Division and Multiplication goes to left to right and if u see the first number you divide it and after you multiply it
Problem:
John is having a party and he invites 21 people.John has $36.75 and he wants to buy cheese burgers for everyone.Cheeseburgers cost $1.75 each. Does he have enough?
Answer:Yes, John has enough to buy 21 cheese burgers for his friends.
Try to find out how he has enough.
Here's a link where you can learn and practice using BEDMAS