Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 1/21 of 21/80?"
121 × 2180 is 180.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21×21/80 1/21×42/80 1/42×21/80 3/21×21/80 1/21×63/80 1/63×21/80 5/21×21/80 7/21×21/80
© everydaycalculation.com