It means the closest answer that you can come up with.
Closest answer
Think of pi as infinity. It never ends. You might mean "3.14" as an approximation of pi, though.
A expression in maths is a collection of terms without an equality sign.
Its maths
"tenth"
What symbol
division
mean no
Related to.
direction
circle
Adding
The mean is usually the arithmetic mean - there are other means in maths. For a set of numbers, the arithmetic mean is the sum of the numbers divided by the number of numbers.