Solutions by everydaycalculation.com
721 + 121 is 821.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+1/21 7/21+2/21 7/42+1/21 7/21+1/42 7/21+3/21 7/63+1/21 7/21+1/63 35/21+1/21 7/21+5/21 49/21+1/21 7/21+7/21
© everydaycalculation.com