Across
1
Round shape with all points equidistant
3
Single numeral from 0 to 9
4
Number divisible only by 1 and itself
6
Parts per hundred
8
Result of addition
Down
2
Difference between highest and lowest values
4
Result of raising a number to an exponent
5
Math using letters for unknown values
6
Total distance around a shape
7
Longest side of a right triangle