Across
1
Rectangular array of numbers
2
Parts per hundred
9
Single numeral from 0 to 9
10
Number with digits after a point
11
Repeated addition
12
Split into equal parts
Down
2
Result of raising a number to an exponent
3
Result of addition
4
Number less than zero
5
Longest side of a right triangle
6
Math using letters for unknown values
7
Reference line in a graph
8
Number divisible only by 1 and itself
13
Exact correspondence on both sides