Across
1
Result of addition
3
Number with digits after a point
4
Three-sided polygon
6
Number divisible only by 1 and itself
7
Rectangular array of numbers
8
Part of a circle's circumference
9
Single numeral from 0 to 9
10
Visual representation of data
11
Divisible by two
Down
2
Repeated addition
5
Value that does not change
6
Lines that never intersect
9
Line crossing from corner to corner