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