Solutions by everydaycalculation.com
921 - 1421 is -521.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21-14/21 9/21-28/21 9/42-14/21 9/21-14/42 27/21-14/21 9/21-42/21 9/63-14/21 9/21-14/63 45/21-14/21 9/21-70/21 63/21-14/21 9/21-98/21
© everydaycalculation.com