Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 12/21 of 15/42?"
1221 × 1542 is 1049.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21×15/42 12/21×30/42 12/42×15/42 12/21×15/84 36/21×15/42 12/21×45/42 12/63×15/42 60/21×15/42 12/21×75/42 84/21×15/42
© everydaycalculation.com