Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 4/10 of 20/40?"
410 × 2040 is 15.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/10×20/40 4/20×20/40 4/10×20/80 12/10×20/40 4/10×60/40 4/30×20/40 20/10×20/40 4/50×20/40 28/10×20/40 4/70×20/40
© everydaycalculation.com