Question

The expression 2(l + w) is used to calculate the perimeter of a rectangle, where l is length and w is width. If the length is Fraction 2 over 3 unit and the width is Fraction 1 over 3 unit, what is the perimeter of the rectangle in units?

Answer 1

• the formula is 2(l × w),

• (Length) 2/5 + 2/5 (the same thing as multiplying it by two) which equals 4/5.

• Then we do the same for the width:

(Width) 1/5 + 1/5 (also the same thing as multiplying by two) to get 2/5.

Now we just add both fractions: 4/5 + 2/5 = 1 1/5 

Answer 2

So basically, since the formula is 2(l × w), we will do:

(Length) 2/5 + 2/5 (the same thing as multiplying it by two) which equals 4/5.

Then we do the same for the width:

(Width) 1/5 + 1/5 (also the same thing as multiplying by two) to get 2/5.

Now we just add both fractions: 4/5 + 2/5 = 1 1/5 

So the answer is C.