横向
1
Math using letters for unknown values
5
Mathematical rule or equation
6
Part of a whole number
8
Split into equal parts
9
Number less than zero
13
Repeated addition
14
Divisible by two
纵向
2
Closed shape with straight sides
3
Amount of space an object occupies
4
Mathematical statement of equality
7
Result of multiplication
10
U-shaped curve of a quadratic function
11
Number greater than zero
12
Lines that never intersect
15
Steepness of a line