Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 15/21 of 3/21?"
1521 × 321 is 549.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21×3/21 15/21×6/21 15/42×3/21 15/21×3/42 45/21×3/21 15/21×9/21 15/63×3/21 15/21×3/63 75/21×3/21 15/21×15/21
© everydaycalculation.com