Solutions by everydaycalculation.com
320 - 720 is -15.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/20-7/20 3/20-14/20 3/40-7/20 3/20-7/40 9/20-7/20 3/20-21/20 3/60-7/20 3/20-7/60 15/20-7/20 3/20-35/20 21/20-7/20 3/20-49/20
© everydaycalculation.com