How to write 2.3 and 5.06 as a fraction multiplication problem

Which expression shows the sum of the polynomials with like terms grouped together

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6

What is the missing statement in step 4? ? rts ? ? vtu and ? rtu ? ? vts ? rts ? ? rvs and ? rtu ? ? stv ? vrs ? ? vru and ? usr ? ? usv ? vur ? ? vus and ? uvs ? ? sru