Solutions by everydaycalculation.com
821 - 121 is 13.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21-1/21 8/21-2/21 8/42-1/21 8/21-1/42 24/21-1/21 8/21-3/21 8/63-1/21 8/21-1/63 40/21-1/21 8/21-5/21 56/21-1/21 8/21-7/21
© everydaycalculation.com