Across
1
Lines that never intersect
3
Single numeral from 0 to 9
5
Exact correspondence on both sides
6
Mathematical statement of equality
7
Space between two intersecting lines
9
Parts per hundred
Down
1
Total distance around a shape
2
Collection of distinct elements
4
Number with digits after a point
5
Result of addition
8
Closed shape with straight sides
10
Repeated addition