Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 7/20 of 6/40?"
720 × 640 is 21400.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/20×6/40 7/20×12/40 7/40×6/40 7/20×6/80 21/20×6/40 7/20×18/40 7/60×6/40 35/20×6/40 7/20×30/40 49/20×6/40 7/20×42/40
© everydaycalculation.com