Across
1
Divisible by two
3
Comparison of two quantities
6
Value that does not change
8
Reference line in a graph
9
Amount of space an object occupies
Down
2
The number representing nothing
3
Difference between highest and lowest values
4
Part of a line with two endpoints
5
Collection of distinct elements
7
Result of multiplication
10
Number less than zero
11
Rectangle with four equal sides