ADDING FRACTIONS 2
Here are two links to the Khan Academy videos on adding fractions with different denominators.
The first link shows how we add fractions pictorially (using pictures).
The second link shows how you calculate with numbers (symbolically).
There are also questions for you to try yourself.
MULTIPLYING FRACTIONS 1
This Khan Academy video is very important to watch before multiplying fractions 2 as it explains pictorially (using pictures) what we do when multiplying fractions.