Solutions by everydaycalculation.com
68 - 78 is -18.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/8-7/8 6/8-14/8 6/16-7/8 6/8-7/16 18/8-7/8 6/8-21/8 6/24-7/8 6/8-7/24 30/8-7/8 6/8-35/8 6/40-7/8 6/8-7/40 42/8-7/8 6/8-49/8 6/56-7/8 6/8-7/56
© everydaycalculation.com