Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/70 of 70/90?"
2170 × 7090 is 730.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/70×70/90 63/70×70/90
© everydaycalculation.com