Solutions by everydaycalculation.com
221 - 321 is -121.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21-3/21 2/21-6/21 2/42-3/21 2/21-3/42 6/21-3/21 2/21-9/21 2/63-3/21 2/21-3/63 10/21-3/21 2/21-15/21 14/21-3/21
© everydaycalculation.com