Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/42 of 5/7?"
2142 × 57 is 514.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/42×10/7 21/84×5/7 21/42×5/14 63/42×5/7 21/42×15/7 21/42×5/21 21/42×25/7 21/42×5/35 21/42×35/7 21/42×5/49
© everydaycalculation.com