Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 15/90 of 12/21?"
1590 × 1221 is 221.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/90×12/21 15/90×24/21 15/90×12/42 45/90×12/21 15/90×36/21 15/90×12/63 75/90×12/21 15/90×60/21 15/90×84/21
© everydaycalculation.com