Across
1
Closed shape with straight sides
4
Comparison of two quantities
5
Sum divided by count
7
The number representing nothing
12
System of ordered marks for measuring
13
Rectangular array of numbers
Down
2
Steepness of a line
3
Number less than zero
6
Symbol representing unknown value
8
Result of raising a number to an exponent
9
Result of multiplication
10
Part of a whole number
11
Divisible by two