Solutions by everydaycalculation.com
630 - 2030 is -715.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/30-20/30 6/30-40/30 6/60-20/30 6/30-20/60 18/30-20/30 6/30-60/30 6/90-20/30 6/30-20/90 42/30-20/30
© everydaycalculation.com