Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 12/21 of 30/40?"
1221 × 3040 is 37.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21×30/40 12/21×60/40 12/42×30/40 12/21×30/80 36/21×30/40 12/21×90/40 12/63×30/40 60/21×30/40 84/21×30/40
© everydaycalculation.com