Solutions by everydaycalculation.com
1040 - 1540 is -18.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40-15/40 10/40-30/40 10/80-15/40 10/40-15/80 30/40-15/40 10/40-45/40 50/40-15/40 10/40-75/40 70/40-15/40
© everydaycalculation.com