Solutions by everydaycalculation.com
821 + 621 is 23.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21+6/21 8/21+12/21 8/42+6/21 8/21+6/42 24/21+6/21 8/21+18/21 8/63+6/21 8/21+6/63 40/21+6/21 8/21+30/21 56/21+6/21 8/21+42/21
© everydaycalculation.com