Solutions by everydaycalculation.com
221 - 821 is -27.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21-8/21 2/21-16/21 2/42-8/21 2/21-8/42 6/21-8/21 2/21-24/21 2/63-8/21 2/21-8/63 10/21-8/21 2/21-40/21 14/21-8/21 2/21-56/21
© everydaycalculation.com