横向
1
Number greater than zero
4
Result of addition
5
Result of raising a number to an exponent
6
Math using letters for unknown values
7
Symbol representing unknown value
8
Number divisible only by 1 and itself
9
Steepness of a line
纵向
1
U-shaped curve of a quadratic function
2
Number with digits after a point
3
Reference line in a graph
4
Exact correspondence on both sides