Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 12/21 of 21/63?"
1221 × 2163 is 421.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21×21/63 12/21×42/63 12/42×21/63 36/21×21/63 12/63×21/63 60/21×21/63 84/21×21/63
© everydaycalculation.com