Solutions by everydaycalculation.com
520 - 1220 is -720.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-12/20 5/20-24/20 5/40-12/20 5/20-12/40 15/20-12/20 5/20-36/20 5/60-12/20 5/20-12/60 25/20-12/20 5/20-60/20 35/20-12/20 5/20-84/20
© everydaycalculation.com