**Wonderful You**

Janet Elkins Douglass Middle Math & Science Academy

543 N. Waller

Chicago IL 60644

(312) 534-6176

**Objectives**:

Middle grades through 8th

1. Practice with linear metric measurement

2. Appreciation of differences/acceptance of diversity

**Materials Needed**:

2-meter stick several 1-meter sticks flexible metric tape lines

paper/pencil calculator 3 X 5 cards

**Strategy**:

1. Have students guess if they are rectangles or squares if one compared the

individual's height with the measurement of fingertip to fingertip of the

outstretched arms. Mount a 2-meter stick along a free area for taller

students. Group will take each others measurements, and determine if

the guesses were correct. Take hand count of those who were surprised by the

outcome.

2. Task is to determine the PERCENT or PROPORTION that the legs are of the

total height per student. The "nice" way to take this measurement is to have

the person being measured hold a 1-meter stick horizontally AT the top of the

legs. Partner will then measure from the floor with another meter stick.

Height is already known. Percent is found by dividing the leg length BY the

height, then TIMES 100. EXAMPLE: legs 84 cm divided by height of 200 cm = 42%

Write the percent legs you are on your 3 X 5 card. Students will arrange

themselves in an increasing or decreasing line by the legs proportion.

OBSERVE the differing heights all along the line. Reassemble with height being

the determining factor. Observe differing leg proportion with students on

each side of you.

**Performance Assessment**:

1. Teacher observation

2. Student "a-ha" at diversity of leg proportion vs. height accompanied by

verbalization or written group report.

3. Students repeat activity with the HEAD height being the proportional factor.

**Extensions**:

There are some proportions that are different during our lifetimes. Ask

students if a baby's legs would be the same proportion as ours. (No) Ask when

leg growth spurt PROBABLY starts. (Teens) * The diameter of the fist is

approximately the length of a foot. (Useful to know when you are buying socks

and don't want to take off your shoes!) * Twice to three times the

circumference is approximately your height. * The measurement between your

wrist and your elbow is also approximately your foot length. (Fool others by

asking for the wrist to elbow length, then say that you can "guess" who has

the biggest or smallest feet.

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