Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/80 of 12/90?"
2180 × 1290 is 7200.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80×12/90 21/80×24/90 63/80×12/90 21/80×36/90 21/80×60/90 21/80×84/90
© everydaycalculation.com