Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/90 of 18/81?"
2190 × 1881 is 7135.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90×18/81 21/90×36/81 63/90×18/81 21/90×54/81 21/90×90/81
© everydaycalculation.com