Fill in the blanks to each of the following problems using your C-strips. To do this, take the color strip shown after the multiplication sign and make a train after that color that is equal in length to the right side of the equal sign. Second, take the train and form it into a rectangle. Then form a strip that fits across the width of the rectangle. Write the abbreviation for that strip in the blank.
a. \boxed{} \times W = R
b. \boxed{} \times P = N
c. \boxed{} \times R = H
d. \boxed{} \times S = S
e. \boxed{} \times L = B
