Solutions by everydaycalculation.com
820 - 1220 is -15.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/20-12/20 8/20-24/20 8/40-12/20 8/20-12/40 24/20-12/20 8/20-36/20 8/60-12/20 8/20-12/60 40/20-12/20 8/20-60/20 56/20-12/20 8/20-84/20
© everydaycalculation.com