Multiplying comes BEFORE adding.
Remember: Please Excuse My Dear Aunt Sally for the order of operations
Parentheses
Exponents
Multiplication/Division
Addition/Subtraction
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Since 12=10+2 We first multiply 7 by 10 to get 70 and then 7 by 2 to get 14 adding these gives us our final answer: 84
Adding the zeros
For subtracting and adding you cannot add or subtract unalike things. For multiplication and division you can multiply by whatever you want. In some maths you even multiply by variables such as "x". Or divide by them.
If the action is multiply the number by 12, the inverse operation is n/12. If the action is multiply 12 by n, the inverse operation is 12/n.
25 and 5 (multiply) 100 and 25 (adding)