Solutions by everydaycalculation.com
240 - 1640 is -720.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/40-16/40 2/40-32/40 2/80-16/40 2/40-16/80 6/40-16/40 2/40-48/40 10/40-16/40 2/40-80/40 14/40-16/40
© everydaycalculation.com