Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/30 of 21/28?"
2130 × 2128 is 2140.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30×21/28 21/30×42/28 21/60×21/28 21/30×21/56 63/30×21/28 21/30×63/28 21/90×21/28 21/30×21/84
© everydaycalculation.com