Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/42 of 15/21?"
2142 × 1521 is 514.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/42×30/21 21/84×15/21 21/42×15/42 63/42×15/21 21/42×45/21 21/42×15/63 21/42×75/21
© everydaycalculation.com