Across
1
Comparison of two quantities
4
Divisible by two
5
Mathematical rule or equation
6
Symbol representing unknown value
7
Exact correspondence on both sides
9
Steepness of a line
10
U-shaped curve of a quadratic function
Down
2
Math using letters for unknown values
3
Number greater than zero
8
The number representing nothing
9
System of ordered marks for measuring
11
Result of addition