Across
1
Three-sided polygon
2
Parts per hundred
5
Sum divided by count
8
Comparison of two quantities
Down
2
Number greater than zero
3
The number representing nothing
4
Difference between highest and lowest values
6
Math using letters for unknown values
7
Longest side of a right triangle
9
Middle value in an ordered dataset
10
Single numeral from 0 to 9
11
U-shaped curve of a quadratic function
12
Round shape with all points equidistant