Across
1
Number with digits after a point
3
Parts per hundred
7
Part of a whole number
8
The number representing nothing
11
Math using letters for unknown values
12
Steepness of a line
Down
1
Line crossing from corner to corner
2
Sum divided by count
4
Line segment connecting two circle points
5
Round shape with all points equidistant
6
Number divisible only by 1 and itself
9
Number greater than zero
10
Collection of distinct elements