Solutions by everydaycalculation.com
390 + 990 is 215.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/90+9/90 3/90+18/90 9/90+9/90 3/90+27/90 15/90+9/90 3/90+45/90 21/90+9/90 3/90+63/90
© everydaycalculation.com