Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/40 of 45/80?"
2140 × 4580 is 189640.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40×45/80 21/40×90/80 21/80×45/80 63/40×45/80
© everydaycalculation.com