Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/60 of 12/30?"
2160 × 1230 is 750.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/60×12/30 21/60×24/30 21/60×12/60 63/60×12/30 21/60×36/30 21/60×12/90 21/60×60/30 21/60×84/30
© everydaycalculation.com