Across
1
Amount of space an object occupies
4
Part of a whole number
5
Steepness of a line
6
Number less than zero
7
Symbol representing unknown value
10
Visual representation of data
11
Single numeral from 0 to 9
Down
2
Sum divided by count
3
Proven mathematical statement
5
Result of addition
8
Middle value in an ordered dataset
9
Line crossing from corner to corner
12
Number divisible only by 1 and itself
13
Closed shape with straight sides