Lesson: Changing the Subject of a Formula Mathematics • 9th Grade

In this lesson, we will learn how to rearrange simple formulas using inverse operations.

Lesson Plan

Students will be able to

rearrange a formula in one step to change the subject,
rearrange a formula in two steps to change the subject,
rearrange a formula to change the subject before substituting in values of the variables,
solve more complex problems, including writing and rearranging a formula from a geometric context.

Lesson Playlist

02:57
01:29
+7

01:46

Lesson Worksheet

Q1:

Solve with an expression for in terms of .

Q2:

Rearrange to make the subject.

Q3:

In 1897, Amos Dolbear derived a formula linking the number of cricket chirps and the temperature. The law states that the temperature , in degrees Celsius, is related to the number of cricket chirps in a minute by the formula

Rearrange the formula to make the subject.

Given that the temperature on a particular day is , estimate the number of cricket chirps that you would expect to hear in a minute.