Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/80 of 40/45?"
2180 × 4045 is 730.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/80×40/45 21/80×80/45 21/80×40/90 63/80×40/45
© everydaycalculation.com