Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/42 of 5/21?"
2142 × 521 is 542.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/42×10/21 21/84×5/21 21/42×5/42 63/42×5/21 21/42×15/21 21/42×5/63 21/42×25/21 21/42×35/21
© everydaycalculation.com