Peter measured the width of one cardboard strip as 3 1/4 ft. a second cardboard strip measured 3 2/3 ft in width. estimate the combined width of the cardboard strips. a. 12 ft b. 6 ft c. 5 ft d. 7 ft

The combined width would be adding the two widths together.

3 1/4 + 3 2/3

Fist convert each number into an improper fraction, find a common denominator , add them together then convert back to a proper fraction.

3 1/4 = 13/4
3 2/3 = 11/3

13/4 + 11/3

Common denominator of 3 and 4 = 12

13/4 = 39/12

11/3 = 44/12

39/12 + 44/12 =  83/12

Now convert back to a proper fraction:

83/12 = 6 11/12, which can be rounded up to 7 feet.

 The answer is D.