Across
1
Rectangular array of numbers
4
System of ordered marks for measuring
5
Number less than zero
6
Mathematical statement of equality
8
Sum divided by count
11
Distance from center to edge of circle
Down
2
Rectangle with four equal sides
3
Math using letters for unknown values
4
Steepness of a line
7
U-shaped curve of a quadratic function
9
Middle value in an ordered dataset
10
The number representing nothing
12
Parts per hundred