Here are the basic models. You can also check out the other variations of the fractions model .

To show half, draw 2 equal boxes to represent the total number of equal parts and shade 1 part out of the 2 equal parts.

Similarly, to show one-third, draw 3 equal boxes to represent the total number of equal parts and shade 1 part out of the 3 equal parts.

To show three-quarters, draw 4 equal boxes to represent the total number of equal parts and shade 3 parts out of the 4 equal parts.

We can also assign a numerical value to a fractional part/fractional parts of the model.

E.g. One-third of a number is 7.

E.g. Three-quarter of a number is 18.