Question

Ivan found the change in a scale factor. His work is shown below. What error did Ivan make?

Old length = 35 feet New length = 10 feet

Answer 1

Ivan wrote the ratio incorrectly. The ratio should be written as the old length to the new length, so it should be 35/10, which reduces to 7/2. When going from larger to smaller dimensions, the change in the scale factor is a ratio that looks like an improper fraction, with a larger number in the numerator and a smaller number in the denominator.