Solutions by everydaycalculation.com
1660 - 3660 is -13.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/60-36/60 16/60-72/60 48/60-36/60 80/60-36/60
© everydaycalculation.com