Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 20/21 of 2/10?"
2021 × 210 is 421.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21×2/10 20/21×4/10 20/42×2/10 20/21×2/20 60/21×2/10 20/21×6/10 20/63×2/10 20/21×2/30 20/21×2/50 20/21×14/10 20/21×2/70
© everydaycalculation.com