Add
increas
To attach or add
YOU add and multiply
ADD
to do it in your head its mental math.
In math the mean is the average. If you want the mean of a group of numbers you add them all together. Then you divide by the how many numbers there are.
add muliply subtract and divide
Divide
it means to add
checks, currency, or coins put into a bank account.
do you mean math equation? If you add a number to both sides of an equation you do not change it. That is called algebra