Across
1
Rectangular array of numbers
3
System of ordered marks for measuring
4
Exact correspondence on both sides
6
The number representing nothing
7
Visual representation of data
8
Part of a whole number
10
Sum divided by count
11
Three-sided polygon
Down
1
Repeated addition
2
Split into equal parts
5
U-shaped curve of a quadratic function
9
Result of raising a number to an exponent
12
Line touching circle at one point
13
Number that divides evenly into another