Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/35 of 21/80?"
2135 × 2180 is 63400.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35×21/80 21/35×42/80 21/70×21/80 63/35×21/80 21/35×63/80
© everydaycalculation.com