Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/42 of 27/40?"
2142 × 2740 is 2780.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/42×54/40 21/84×27/40 21/42×27/80 63/42×27/40 21/42×81/40
© everydaycalculation.com