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Quick! Tell me how many seconds are in a year!!!!

**The best way to understand the rules for converting is to see them in action. **

**Let's start with an example problem and go through the rules as we solve the problem. **

**You will want to have a pencil, a calculator, and a piece of paper ready to go.**

**A roll of Christmas wrapping paper contains **

**2.5 meters of paper. What is the length of the paper in yards?**

Step 1: Write down the known values and the unknown values.

Step 2: Find the conversion factor that gives a ratio between meters and yards.

Step 3: Write the conversion factor as a fraction with the unit you want to convert to on top and set the problem up as an equation.

**2.5 meters x 1.09yards = **

**1 meter**

*2.725 yards*

You can see that the unit *meters *will cancel.

*Convert 325 millimeters to meters.*

Step 1: Write down the known values and the unknown values.

Find the conversion factor that gives a ratio between meters and millimeters.

**1 meter = 1000 mm**

Step 3: Write the conversion factor as a fraction with the unit you want to convert to on top and set the problem up as an equation.

**325mm = 1 meter =**

**1000 mm**

*.325 meters*

**The unit**

*millimeters*

**will cancel.**

**How many centuries are in 237,439 days?**

Step 1:

Step 2:

Step #3

Equation:

**237,439 days x 1year x 1century = **

**365 days 100 years **

*237,439 = *

*36500 *

6.51 centuries

The units *days *and*years *will cancel.

*Always remember to put the unit that you want to convert to on top!*

*All conversion factors must be labeled! *

*(meter, liter, year, etc .)*

How many seconds are in 768 days?

A car has traveled 7.2 miles. How many inches did the car travel?