Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 40/63 of 21/90?"
4063 × 2190 is 427.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/63×21/90 40/63×42/90 40/63×63/90
© everydaycalculation.com