Across
1
Difference between highest and lowest values
3
Number greater than zero
5
Divisible by two
6
The number representing nothing
10
Number that divides evenly into another
11
Lines that never intersect
Down
2
Round shape with all points equidistant
3
Number divisible only by 1 and itself
4
Closed shape with straight sides
7
Value that does not change
8
Line touching circle at one point
9
System of ordered marks for measuring
11
Result of multiplication