1. Bob puts 5 posts into the ground. How many chains will he need?

2. Fill in the missing numbers in this table:

Number of posts, P : 1, 2, 3, 4, 5, 6, 7

Number of chains,C: 0, 3, 6, blank, blank, blank, blank


3. Describe how the number of chains change in the table.

4. a) Create a rule or formula that will help you find the number of chains (C) needed to make a fence when you know the number of posts (P).

Let:
Number of posts, P
Number of chains, C

b) Explain in words why your rule or formula works.