demonstrate multiplying a whole number with a fraction
$$4\times \frac{3}{4}\\\\ =\frac{\not{4}}{1}\times \frac{3}{\not{4}}\\\\ =\frac{3}{1}\\\\ =3$$
1. 4 x 3/4
2. 4/1 x 3/4
3. 4x3/1x4
4. 12/4
5. 3