Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 12/21 of 21/30?"
1221 × 2130 is 25.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21×21/30 12/21×42/30 12/42×21/30 12/21×21/60 36/21×21/30 12/21×63/30 12/63×21/30 12/21×21/90 60/21×21/30 84/21×21/30
© everydaycalculation.com