Across
1
Result of multiplication
5
Number divisible only by 1 and itself
6
Total distance around a shape
7
Reference line in a graph
8
Collection of distinct elements
10
Comparison of two quantities
11
Part of a line with two endpoints
12
Value that does not change
Down
2
Exact correspondence on both sides
3
Single numeral from 0 to 9
4
Line touching circle at one point
5
Parts per hundred
9
Rectangle with four equal sides
13
Difference between highest and lowest values