Across
1
Symbol representing unknown value
6
Number divisible only by 1 and itself
7
Mathematical statement of equality
8
Closed shape with straight sides
9
Number that divides evenly into another
Down
2
Split into equal parts
3
Value that does not change
4
Steepness of a line
5
Result of multiplication
10
Exact correspondence on both sides
11
Result of raising a number to an exponent
12
System of ordered marks for measuring
13
Middle value in an ordered dataset