Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/28 of 5/21?"
2128 × 521 is 528.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28×5/21 21/28×10/21 21/56×5/21 21/28×5/42 63/28×5/21 21/28×15/21 21/84×5/21 21/28×5/63 21/28×25/21 21/28×35/21
© everydaycalculation.com