Ana walked 2 1/2 miles on the Freedom Trail. She walked 5/8 mile from Boston Common to the Paul Revere House. Then, she walked 3/8 mile from the Paul Revere House to Copp Hill Burying Ground. How many more miles did Ana walk to complete the trail to the USS Constitution?
I have no idea what the total should be. What you have so far is
d = 2 1/2 miles + 5/8 miles + 3/8 miles d = 5/2 + 5/8 + 3/8 The common denominator is 8. To change 5/2 to something over 8, you have to multiply top and bottom of 5/2 by 4 5*4/2*4 = 20 / 8
d = 20/8 + 5/8 + 3/8 d = 28 / 8 d = 3 4/8 d = 3 1/2 miles