Across
1
Repeated addition
3
Single numeral from 0 to 9
4
Sum divided by count
11
Number less than zero
12
Part of a line with two endpoints
13
Amount of space an object occupies
Down
2
Split into equal parts
5
Space between two intersecting lines
6
The number representing nothing
7
U-shaped curve of a quadratic function
8
Lines that never intersect
9
Number with digits after a point
10
Distance from center to edge of circle