Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 3/21 of 42/80?"
321 × 4280 is 340.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21×42/80 3/21×84/80 3/42×42/80 9/21×42/80 3/63×42/80 15/21×42/80
© everydaycalculation.com