Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/28 of 7/80?"
2128 × 780 is 21320.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28×7/80 21/28×14/80 21/56×7/80 63/28×7/80 21/28×21/80 21/84×7/80 21/28×35/80 21/28×49/80
© everydaycalculation.com