Across
1
Parts per hundred
2
Rectangle with four equal sides
6
Proven mathematical statement
7
Number with digits after a point
8
Single numeral from 0 to 9
9
Reference line in a graph
10
Amount of space an object occupies
11
Sum divided by count
Down
1
Lines that never intersect
2
System of ordered marks for measuring
3
Collection of distinct elements
4
Rectangular array of numbers
5
Result of addition
12
Middle value in an ordered dataset
13
Exact correspondence on both sides