1(mp use structure miguel uses base-ten blocks to
show that 3,200 people are at a museum. how can
you regroup and rename the number 3,200?
3,200

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?