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Introduction to Linear Measurement: Inches and Centimeters

Explore linear measurement concepts using inches and centimeters. Learn about line segments, segment addition postulate, and Rally Coach activity. Practice measuring objects in the classroom. Engage in finding segment lengths and solving measurement problems collaboratively.

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Introduction to Linear Measurement: Inches and Centimeters

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  1. August 24, 2010 Linear Measurement

  2. Bellringer • Put your name on your homework and pass it to the front. • What is ¾ + 5/6 ?

  3. Unlike a line, a line segment, can be measured because it has two endpoints. • A segment with endpoints A and B can be name AB or BA. • The length or measure of AB is written AB.

  4. Introduction to measurement Inches

  5. Centimeters

  6. A standard ruler

  7. Challenge… • With your shoulder partner, find something in the room that is • A) 5 inches • B) 3.7 cm • C) Measure the length of Partner A’s pencil/pen in inches • D)Measure the length of Partner B’s pinky finger in centimeters

  8. Segment Addition Postulate • If M is between P and Q, then PM+MQ=PQ Q P M

  9. Two segments having the same measure are congruent ( )

  10. Rally Coach • Partners take turns, one solving a problem while the other coaches. • 1. Partner A solves the first problem. • 2. Partner B watches and listens, checks, coaches if necessary, and praises. • 3. Partner B solves the next problem. • 4. Partner A watches and listens, checks, coaches if necessary, and praises.

  11. Partner A- Draw DE that is 3 1/16 inches long. • Partner B- Draw FG that is 2 ¾ inches long.

  12. Partner A, Find LM, if MN=2.6 cm and LN=4 cm. L M N

  13. Partner B, Find LN, if LM= in and MN=2 ½ in. L M N

  14. Scribe and Sage

  15. Find x and ST if T is between S and U, ST=7x, SU=45, and TU=5x-3 U T S 5x-3 7x 45

  16. Summary: • What measurement do the little lines on the inch side of a ruler show? • How many divisions are there in a centimeter on a ruler? • What does the angle addition postulate say?

  17. TIME

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