You can multiply the answer to see if it's right. same with multiplication, addition, and subtraction. Multiplication, you divide, to check addition, you subtract, and subtract, you add.
removing the parentheses in a math problem
1 divided by 3
Parentheses is when you are doing an equation, and you solve the problem.
Math rules depend on what kins of problem you are doing.
In math, check means to check your work by reversing the problem and making sure it works out.
by doing math
Yes, you do that first.
Gain means to subtract in a math problem because if you were doing a math problem and it said to gain (loose) 9-8=1 so that would be your answer
Unless your math problem has anything to do with adding, dividing, multipling, or subtracting any beauty products then I don't know.
An estimated math answer is one that is guessed based on what you know without actually doing the problem.
No ,doing math in your head is called mental math ;which is only used if you were to be skip counting or any other thing's hopefully i answered it pretty good.
Just answer the problem by actually picking numbers from the solution and doing it.