Subtracting mixed numbers with regrouping (unlike denominators) Khan Academy 346 03:50
Subtracting fractions with unlike denominators Khan Academy 388 05:00
Adding mixed numbers: 19 3/18 + 18 2/3 Khan Academy 442 02:20
Subtracting mixed numbers: 7 6/9 - 3 2/5 Khan Academy 443 02:30
