Across
1
Parts per hundred
3
Reference line in a graph
6
Exact correspondence on both sides
7
Part of a whole number
8
Lines that never intersect
9
Result of raising a number to an exponent
10
Longest side of a right triangle
11
Math using letters for unknown values
Down
1
Total distance around a shape
2
Difference between highest and lowest values
4
Number with digits after a point
5
Rectangular array of numbers
12
Number divisible only by 1 and itself
13
Three-sided polygon