7 1/4 + 5 3/5 First, you need a common denominator to add the two. 20 will work. 4x5=20, so we have to also multiply 1 by 5. 4x5=20, 1x5=5 5x4=20, so we have to also multiply 3 by 4. 5x4=20, 3x4=12 And now we put the fractions back in. 7 5/20 + 5 12/20 And add them. 7 5/20 + 5 12/20 = 12 17/20 Now, we're supposed to reduce it to its lowest form. Unfortunately, the fraction cannot be reduced, because 17 is a prime number, meaning there are no factors to it except one and itself. Therefore, the lowest form of 12 17/20 is 12 17/20 Your answer is B, 12 17/20
