Across
1
Single numeral from 0 to 9
4
Line crossing from corner to corner
5
Amount of space an object occupies
6
Number less than zero
7
Number with digits after a point
Down
2
Value that does not change
3
Symbol representing unknown value
8
Number divisible only by 1 and itself
9
U-shaped curve of a quadratic function
10
Middle value in an ordered dataset
11
Total distance around a shape