Which operation should we do first?

When we are faced with an EXPRESSION to be simplified, sometimes there are many operations (+, - , *, /)
within the expression.
For example how do we handle:   "2 PLUS 3 TIMES 4"
Without commas we do not know which operation to perform first.
---Do we Add 2 and 3 and then multiply by 4?
---OR should we multiplying 3 times 4 and then adding 2?
Mathematicians have come to an agreement that we will
MULTIPLY first and then ADD in this kind of problem.