Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/35 of 21/60?"
2135 × 2160 is 21100.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/35×21/60 21/35×42/60 21/70×21/60 63/35×21/60 21/35×63/60
© everydaycalculation.com