Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 12/80 of 21/90?"
1280 × 2190 is 7200.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/80×21/90 12/80×42/90 36/80×21/90 12/80×63/90 60/80×21/90 84/80×21/90
© everydaycalculation.com