Across
1
Repeated addition
5
Closed shape with straight sides
6
Number less than zero
11
Part of a circle's circumference
Down
2
Result of addition
3
Exact correspondence on both sides
4
Amount of space an object occupies
7
Part of a whole number
8
Space between two intersecting lines
9
Line crossing from corner to corner
10
Math using letters for unknown values
12
Number that divides evenly into another