Across
1
Rectangle with four equal sides
4
Difference between highest and lowest values
5
Result of raising a number to an exponent
6
Value that does not change
7
Repeated addition
8
Symbol representing unknown value
9
Number divisible only by 1 and itself
11
The number representing nothing
12
Distance from center to edge of circle
14
Divisible by two
Down
2
Math using letters for unknown values
3
Total distance around a shape
10
Number less than zero
13
Closed shape with straight sides