Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 15/21 of 5/15?"
1521 × 515 is 521.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21×5/15 15/21×10/15 15/42×5/15 15/21×5/30 45/21×5/15 15/63×5/15 15/21×5/45 75/21×5/15 15/21×25/15 15/21×5/75 15/21×35/15
© everydaycalculation.com