Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/80 of 18/90?"
2180 × 1890 is 21400.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80×18/90 21/80×36/90 63/80×18/90 21/80×54/90
© everydaycalculation.com