Solutions by everydaycalculation.com
721 + 421 is 1121.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+4/21 7/21+8/21 7/42+4/21 7/21+4/42 7/21+12/21 7/63+4/21 7/21+4/63 35/21+4/21 7/21+20/21 49/21+4/21 7/21+28/21
© everydaycalculation.com