Question

What is the area of a square computer screen with 21-in. sides? 

 
A. 42 sq. in.
B. 441 sq. in.
C. 220 sq. in.
D. 84 sq. in.

I am not so sure if I add all the numbers or multiply them?

My sister told me to pick D but I don't know for sure.

Answer 1

A = s^2
A - 21 * 21

A = ________ sq. in.

Answer 2

Ohh B.441 sq.in.

Answer 3

Yes. B is right.

Answer 4

multiply 21 times 21 to find area.
Don't worry, you'll get the hang of it soon!