Across
1
Value that does not change
4
Lines that never intersect
6
Part of a whole number
7
Sum divided by count
10
Rectangle with four equal sides
11
Mathematical statement of equality
Down
1
Round shape with all points equidistant
2
Symbol representing unknown value
3
Result of addition
5
Comparison of two quantities
8
Line touching circle at one point
9
Difference between highest and lowest values
12
Result of multiplication
13
The number representing nothing