Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 12/80 of 21/81?"
1280 × 2181 is 7180.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/80×21/81 12/80×42/81 36/80×21/81 12/80×63/81 60/80×21/81 84/80×21/81
© everydaycalculation.com