Across
1
Repeated addition
4
Rectangle with four equal sides
6
Number that divides evenly into another
7
Split into equal parts
12
Reference line in a graph
Down
2
Number divisible only by 1 and itself
3
Single numeral from 0 to 9
5
Symbol representing unknown value
8
Part of a whole number
9
Number greater than zero
10
Rectangular array of numbers
11
Result of addition