Across
1
Part of a whole number
5
Mathematical rule or equation
6
Parts per hundred
9
Amount of space an object occupies
10
Sum divided by count
Down
2
Number divisible only by 1 and itself
3
Part of a circle's circumference
4
Longest side of a right triangle
7
The number representing nothing
8
Value that does not change
11
Number with digits after a point