Module 7 Lesson 5Compare and classify other

polygons.

Multiply by 5

5 x 5 = _____

Let’s skip-count up by FIVES to find the answer. Hold up a finger for each five.

5 10 15 20 25

25 3 x 5 = _____15

Let’s see how we can skip-count down also. Start at 25 by holding up five finders.Fold down one finger each time you count down.

4 x 5 = _____20

Multiply by 5 Pattern Sheet

2 minutes

End

Equivalent CountingWith Units of 6

1 2 3 4 5 6 7 8 9 10

1 six 2 sixes

3 sixes

4 sixes

5 sixes

6 sixes

7 sixes

8 sixes

9 sixes

10 sixes

6 12 18 24 30 36 42 48 54 60

1 six 12 3 sixes 24 5

sixes 36 7 sixes 48 9

sixes 60

6 2 sixes 18 4

sixes 30 6 sixes 42 8

sixes 54 10 sixes

First lest count to 10 by ones.Now let’s count up to 10 groups of 6, or 10 sixes.Now skip count to 60 by 6.And for a challenge, let’s alternate between numbers and units of 6.Start with units of 6

And now alternate starting with numbers of 6.

Classify the Polygon

How many sides does this polygon have?4Polygons with four sides are called:

quadrilateralsHow many sets of parallel

lines does this quadrilateral have? 1

Quadrilaterals with one set of parallel lines are called: Trapezoids

!

Classify the Polygon

Is this polygon a quadrilateral?YesHow many right angles does this particular quadrilateral have?Zer

oIs this quadrilateral a trapezoid?Ye

sWhy?

It has at least one set of parallel lines.

Classify the Polygon

How many sets of parallel lines does it have?

Two What do we call all quadrilaterals that have two sets of parallel sides?Parallelograms.

Classify the Polygon

Is this polygon a quadrilateral?

Yes

How many right angles does this quadrilateral have?

Four.

Classify the Polygon

Is this polygon a trapezoid?Yes

Why? It has at least one set of parallel lines.

Classify the Polygon

Is this trapezoid also a parallelogram?

Yes

Why? It has two sets of parallel lines.

Classify the Polygon

Is this parallelogram also a rectangle?

Yes

Why? It has two sets of parallel lines and four right angles.

Classify the Polygon

Is this polygon a quadrilateral?

This is a SQUARE.

☐Is this polygon a trapezoid?☐Is this polygon a parallelogram?☐Is this polygon a rectangle?☐Does this polygon have 4 sides of the same length?

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Concept Development

• You will need your index card, lesson 5 template, lesson 5 problem set, a pair of scissors, and a ruler.

• DO NOT CUT OR WRITE ON ANYTHING.

• Thumbs up when you have everything.

Group Polygons

• Look at Polygons M-X compare them with yesterday’s polygons.

• Yesterday we grouped polygons with four sides.• Today we are first going to group polygons with

all equal sides.• What tool are we going to use to make sure the

sides are precisely equal?• A ruler

• What will be the most precise measurement? Inches, half-inches, quarter-inches or centimeters?

• Quarter Inches, because they are the smallest unit.

Group Polygons• Now measure the sides of all polygons M-

X to the nearest quarter inch.• Write the measurements on the inside

lines so you will remember them later.• Cut out the Polygons M-X.• Take your time to make good cuts.• Write your initials on the back of each of

your cut out shapes – that way if we find some on the floor we can get them back to you.

• Throw away/recycle your paper scraps.• Do 5 jumping jacks when you’re done.

Group Polygons

Look at your shapes. Group them into two categories:

ALL SIDES ARE EQUAL

ALL SIDES ARE NOT EQUAL

Once the polygons are grouped, fill out the first two rows of your problems set.

All Sides Are EqualAll Sides Are Not

Equal

Group Polygons

Now look at the next two rows of your problem set:

AT LEAST 1 RIGHT ANGLE

AT LEAST 1 SET OF PARALLEL LINES

When it says “at least” can the polygon have more than one set?

Yes, It just has to have one for sure

Group Polygons

Use your right angle tool to measure and group polygons that have at least one right angle.

Polygons with at least 1 right angle

Group Polygons

Now group polygons with at least one set of parallel lines.

At least one set of parallel lines

Group Polygons

Now let’s look at the polygons with equal sides. What do you notice about the side lengths of the polygon marked S?

They are all the same length.What do we know about the

angles?They are all right angles ...… so they

are all the same.

Group Polygons

A polygon with all equal sides and all equal angles is called a regular polygon. How many sides does this polygon have?

5What do we call a polygon with five sides?

PentagonIs this a regular pentagon?

No, because not all the angles are equal.

Compare Polygons

Count each polygon’s sides, and write the number of sides under the polygon’s letter.

Then group the polygons with the same number of sides.

Compare Polygons

Let’s compare polygon’s with the same number of sides.Both Polygon U and Polygon T have six sides.Polygon U is a hexagon.Is Polygon T a hexagon, too?Yes. It has six sides, but

they are not equal sides … … so Polygon T is a

hexagon but not a regular hexagon.

I’ll call out an attribute.You hold up a polygon that fits the

attribute.

Polygons that do NOT have all equal sides.

Show polygons with EXACTLY one right angle.

Show polygons with FOUR equal sides.

Show polygons with only one set of parallel lines.

Show polygons with exactly 3 sets of parallel lines.

Problem Set

Finish Problems 2 - 4