Question

Can you name some math terms starting with the letter "O" and give a short description of them?

Answer 1

Obtuse angle

Operation

Order of operation

Answer 2

"Order of operations" - the order in which you must simplify an equation 
"Origin" - center of the coordinate plane at (0,0)
"Outlier" - A number in a set of numbers that is way different than the rest (example: 1, 2, 3, 4, 5, 27. 27 is the outlier)
"octagon" - an 8 sided polygon