Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/90 of 21/45?"
2190 × 2145 is 49450.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90×21/45 21/90×42/45 21/90×21/90 63/90×21/45 21/90×63/45
© everydaycalculation.com