Question

Estimate the surface area of a cube with side length 9.9 in.

A) 100 in2
B) 400 in2
C) 600 in2
D) 1000 in2

Answer 1

600 is the answer

Explanation:

We can round each side length to 10 in. Therefore, the area of one face is 100 in2. Since there are 6 congruent faces in a cube, the total estimated surface area of 600 in2.

Answer 2

Estimate the surface area of a cube with side length 9.9 in.

A) 100 in²

B) 400 in²

C) 600 in²

D) 1000 in²

Explanation:

9.9 to the nearest whole number is 10

We know the side length of the cube is 10

We work out the area of face and multiply by 6.

10 x 10 = 100

100 x 6 = 600 in²