Across
1
Part of a line with two endpoints
5
The number representing nothing
6
Parts per hundred
7
Distance from center to edge of circle
Down
1
Rectangle with four equal sides
2
Round shape with all points equidistant
3
Number divisible only by 1 and itself
4
Difference between highest and lowest values
8
Single numeral from 0 to 9
9
Symbol representing unknown value