Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/60 of 30/72?"
2160 × 3072 is 748.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/60×30/72 21/60×60/72 63/60×30/72 21/60×90/72
© everydaycalculation.com