Solutions by everydaycalculation.com
The simplest form of 640320 is 21.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Equivalent fractions: 1280/640 320/160 1920/960 3200/1600 128/64 4480/2240
More fractions: 1280/320 640/640 1920/320 640/960 641/320 640/321639/320 640/319
© everydaycalculation.com