Solutions by everydaycalculation.com
1st number: 40/60, 2nd number: 1 21/60
4060 - 8160 is -4160.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/60-81/60
© everydaycalculation.com