Across
1
Result of addition
3
Math using letters for unknown values
4
Divisible by two
9
Repeated addition
10
Number that divides evenly into another
11
Parts per hundred
12
Three-sided polygon
Down
2
Amount of space an object occupies
5
Lines that never intersect
6
Rectangular array of numbers
7
Steepness of a line
8
System of ordered marks for measuring
13
Number less than zero