To compare volumes, the measurements must be in the same units. There are 12 inches in 1 ft, so Sara’s birdhouse is 1 ft x 12 inches/ft = 12 inches wide, 2 ft x 12 inches/ft = 24 inches tall, and 2 ft x 12 inches/ft = 24 inches deep.
The volume of Sara’s birdhouse is 12 inches x 24 inches x 24 inches = <<12*24*24=6912>>6,912 cubic inches
The volume of Jake’s birdhouse is 16 inches x 20 inches x 18 inches = <<16*20*18=5760>>5,760 cubic inches.
The difference between the two birdhouses is 6,912 cubic inches – 5,760 cubic inches = <<6912-5760=1152>>1,152 cubic inches.
#### 1,152