Solutions by everydaycalculation.com
690 - 390 is 130.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/90-3/90 6/90-6/90 18/90-3/90 6/90-9/90 30/90-3/90 6/90-15/90 42/90-3/90 6/90-21/90
© everydaycalculation.com