Across
1
Single numeral from 0 to 9
4
Mathematical rule or equation
5
Round shape with all points equidistant
7
Sum divided by count
8
Steepness of a line
Down
1
Number with digits after a point
2
Part of a line with two endpoints
3
Part of a whole number
6
Line crossing from corner to corner
9
Line segment connecting two circle points
10
The number representing nothing