Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/60 of 12/40?"
2160 × 1240 is 21200.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/60×12/40 21/60×24/40 21/60×12/80 63/60×12/40 21/60×36/40 21/60×60/40 21/60×84/40
© everydaycalculation.com