Solutions by everydaycalculation.com
390 - 990 is -115.
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