Students learn fundamentals of converting metric measurements.

Objectives:

Standards/PASS Objectives:

• Students will translate a mathematical idea from one form to another.
• Students will compare and convert a given measurement to another unit within the same measurement system.

Teaching Strategies

• teacher directed
• cooperative learning
• questioning

Classroom Management

• whole class for introduction
• groups of 2-3

Vocabulary

• gram-basic metric unit of mass
• meter- basic unit of length
• liter-basic unit of capacity

Materials:

• metric measuring tape or meter sticks
• Worksheet Page 1, Worksheet Page 2
• items to be measured (see worksheet)

Plan:

What could you measure using.... (answers written on board)
   meters--desk, chair leg, height (length)
   grams- school bus, body weight book (mass)
   liter- milk, coke, water in bathtub or pool(capacity)

How do these measurements compare to English units of measuring?
Do they measure the same types of things? How do you know?

DEVELOPMENT OF THE LESSON

Metric units are families. The meter family, the gram family, the liter family.
When we measure something using a metric unit, we can change the unit to another metric unit within the same base unit of family.

For example, we can change centimeters to millimeter, kilometers, etc...
Why do you think we can change these and not others?

However, we can not change meters to grams or liters because the units measure different things. Remember...each unit has a family and must stay in its family

• What did we say grams measured?    
        mass
• How about liters? 
        capacity
• And meters?
         length

Can we change meters to grams? or grams to liters? Or meters to liters?
Why or why not?

Sometimes, we may want to change one unit to another in its family.
(centimeters to decameters)

I am going to show you an easy way to convert units within a certain base unit. Liters, meters, grams

"Put on Board"
K      H      D     unit     D      C      M
Explain that:

K stands for kilo       h stands for hecto        d stands for deka
d stands for deci      c stands for centi         m stands for mili

• notice that there are 2 D's and they each stand for something different

To remember the order of these, THINK:

To convert, startr>