Solutions by everydaycalculation.com
521 - 1521 is -1021.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21-15/21 5/21-30/21 5/42-15/21 5/21-15/42 15/21-15/21 5/21-45/21 5/63-15/21 5/21-15/63 25/21-15/21 5/21-75/21 35/21-15/21
© everydaycalculation.com