All the squares outlined on the model cells are 1 cm by 1 cm.

.Each face of Cube A measures 1 cm long by 1 cm wide.

.Each face of Cube B measures 2 cm long by 2 cm wide.

.Each face of Cube C measures 3 cm long by 3 cm wide.

.Calculate the area of one side of each cube by multiplying the length times the width.

.Calculate the surface area of each cube by multiplying the area of one side of the cube by 6 sides.

.Calculate the volume of each cube by multiplying length times width times height.

.Build the ratio for each cube: (surface area)/volume

.For each cube, divide surface area by volume and round off to the nearest whole number. For example, 1.5 to 1 is 3:2.