Solutions by everydaycalculation.com
The simplest form of 640640 is 11.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Equivalent fractions: 1280/1280 320/320 1920/1920 3200/3200 128/128 4480/4480
More fractions: 1280/640 640/1280 1920/640 640/1920 641/640 640/641639/640 640/639
© everydaycalculation.com