Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 18/21 of 18/90?"
1821 × 1890 is 635.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21×18/90 18/21×36/90 18/42×18/90 54/21×18/90 18/21×54/90 18/63×18/90 90/21×18/90
© everydaycalculation.com