Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/90 of 9/10?"
2190 × 910 is 21100.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90×9/10 21/90×18/10 21/90×9/20 63/90×9/10 21/90×27/10 21/90×9/30 21/90×45/10 21/90×9/50 21/90×63/10 21/90×9/70
© everydaycalculation.com