Across
1
Line crossing from corner to corner
4
Exact correspondence on both sides
7
Number divisible only by 1 and itself
8
Total distance around a shape
9
Divisible by two
10
Round shape with all points equidistant
11
Reference line in a graph
Down
2
Result of multiplication
3
Math using letters for unknown values
4
Result of addition
5
Value that does not change
6
Symbol representing unknown value
7
Lines that never intersect
12
Number greater than zero