Worked examples
Two examples
Example 1
Solve A = lw for w.
- w is multiplied by l. Divide both sides by l.
Answer: w = Al
Example 2
Solve P = 2l + 2w for l.
- Subtract 2w from both sides: 2l = P − 2w.
- Divide the whole side by 2.
Answer: l = P − 2w2
Where this is taught: Circles and Equations, “Turning it around”
The drill
Ten problems
How many:
Tap your answer to each one, then press Check my answers at the bottom.Circle your answer to each one. The answer key, with the reasoning, is on the last page.