Solutions by everydaycalculation.com
1040 - 1840 is -15.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40-18/40 10/40-36/40 10/80-18/40 10/40-18/80 30/40-18/40 10/40-54/40 50/40-18/40 10/40-90/40 70/40-18/40
© everydaycalculation.com