Across
1
Single numeral from 0 to 9
3
Steepness of a line
4
Part of a line with two endpoints
5
Result of addition
8
Difference between highest and lowest values
9
Symbol representing unknown value
Down
1
Number with digits after a point
2
Value that does not change
6
Middle value in an ordered dataset
7
Amount of space an object occupies
10
Divisible by two
11
Total distance around a shape