Across
1
Rectangle with four equal sides
3
Line crossing from corner to corner
5
Value that does not change
9
Sum divided by count
Down
2
Number that divides evenly into another
3
Single numeral from 0 to 9
4
Amount of space an object occupies
6
Math using letters for unknown values
7
U-shaped curve of a quadratic function
8
Difference between highest and lowest values