Across
1
Value that does not change
3
Divisible by two
5
Corner point of a polygon
6
Single numeral from 0 to 9
7
Rectangle with four equal sides
9
Part of a line with two endpoints
10
Result of multiplication
11
Total distance around a shape
Down
2
Rectangular array of numbers
3
Mathematical statement of equality
4
Three-sided polygon
8
Parts per hundred
12
Result of addition