# Changing the subject of a formula

**The subject of a formula**

The subject of a formula is the variable at the front of the equal signed which all the other numbers and operations equal to. For example, in the following formula, *V* is the subject.

*V* = *IR*

**Changing the subject of the formula**

When changing the subject of the formula, the formula will need to be rearranged. For example, to make *I* the subject the following steps are taken.

*V* = *IR *(divide both sides with* R*)

* = I* (flip the sides to make I the subject on the left hand side

*I =
*