Across
1
Middle value in an ordered dataset
3
System of ordered marks for measuring
5
Number that divides evenly into another
6
Symbol representing unknown value
8
Amount of space an object occupies
9
Single numeral from 0 to 9
11
Part of a line with two endpoints
13
Number divisible only by 1 and itself
Down
2
U-shaped curve of a quadratic function
3
Steepness of a line
4
Split into equal parts
7
Repeated addition
10
Number greater than zero
12
Difference between highest and lowest values