Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/40 of 3/12?"
2140 × 312 is 21160.
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/40×3/12 21/40×6/12 21/80×3/12 21/40×3/24 63/40×3/12 21/40×9/12 21/40×3/36 21/40×15/12 21/40×3/60 21/40×21/12 21/40×3/84
© everydaycalculation.com