Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/70 of 21/90?"
2170 × 2190 is 7100.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70×21/90 21/70×42/90 63/70×21/90 21/70×63/90
© everydaycalculation.com