Solve<span> 42 -:— 3 </span>using an area model<span>. Draw a number bond and use the distributive property to </span>solve<span> for the unknown length. ' Lesson 20: </span>Solve<span> division problems without remainders </span>using<span> the </span>area model<span>. 4.</span>
For this case, the first thing we must do is define a variable.
We have then:
x: unknown number
We now write the equation that models the problem:

From here, we clear the value of x.
We multiply both sides of the equation by 2:

We subtract 30 on both sides of the equation:

Answer:
The value of the unknown number is given by:

Because three points of the angle have to be named ex; angle ABC