Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/60 of 72/80?"
2160 × 7280 is 63200.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/60×72/80 63/60×72/80
© everydaycalculation.com