Across
1
Collection of distinct elements
2
Parts per hundred
4
Mathematical rule or equation
6
Repeated addition
7
Value that does not change
9
The number representing nothing
10
Number with digits after a point
13
Sum divided by count
Down
2
Result of multiplication
3
Mathematical statement of equality
5
Single numeral from 0 to 9
8
Lines that never intersect
11
Space between two intersecting lines
12
Part of a circle's circumference