The division problem that can be described using the model of four rectangular strips, each divided into two equal parts, is:
4 ÷ 2
(4 divided by 2)
This is because if you have 4 strips and you divide each strip into 2 equal parts, you are essentially determining how many groups of 2 can be formed from the 4 strips. The other division problems (4 ÷ 1/8, 1 ÷ 1/8, and 4 ÷ 1/2) involve fractions or different grouping scenarios that do not match the description of the model provided.