Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/42 of 20/63?"
2142 × 2063 is 1063.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/42×40/63 21/84×20/63 63/42×20/63 21/42×60/63
© everydaycalculation.com