Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 5/21 of 15/21?"
521 × 1521 is 25147.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21×15/21 5/21×30/21 5/42×15/21 5/21×15/42 15/21×15/21 5/21×45/21 5/63×15/21 5/21×15/63 25/21×15/21 5/21×75/21 35/21×15/21
© everydaycalculation.com