Across
1
Round shape with all points equidistant
2
Result of addition
4
U-shaped curve of a quadratic function
5
The number representing nothing
6
Single numeral from 0 to 9
7
Difference between highest and lowest values
8
Parts per hundred
10
Middle value in an ordered dataset
Down
2
Exact correspondence on both sides
3
Power to which a number is raised
8
Result of raising a number to an exponent
9
Line touching circle at one point