Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 20/40 of 21/70?"
2040 × 2170 is 320.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40×42/70 20/80×21/70 60/40×21/70 20/40×63/70
© everydaycalculation.com