Across
1
Exact correspondence on both sides
4
Steepness of a line
5
Number less than zero
6
Rectangle with four equal sides
9
Single numeral from 0 to 9
Down
2
Comparison of two quantities
3
Number greater than zero
6
Collection of distinct elements
7
System of ordered marks for measuring
8
Closed shape with straight sides
10
Number divisible only by 1 and itself
11
Mathematical rule or equation