The Business of Beads

The Math & Science Center

presents

by Gail Warren

PowerPoint Presentation by Susan L. Cerruti

Can We Fix It?

How Many More?

We know: 1 SET of 7 beads

28 beads in all

How many more SETS of beads do we need?

How Many More?

We write a PROPORTION to get our answer.

A PROPORTION is a math statement of two equal ratios that

compare parts to wholes.

A RATIO is written as a fraction.

Our proportion will compare the total number of beads to the sets of beads on the necklace.

The Proportion

728__ =

1__? How many

SETS of beads on the

necklace?

How many beads on the necklace?

Multiply the two diagonal numbers.

28 x 1 = 28

Divide by the remaining number.

28 - 7 = .. 4

How Many More Sets Do We Need?

There are 4 total sets of beads on the finished necklace, BUT… we already have one.

How many MORE sets do we need?How many beads would that be?

4 – 1 = 33 x 7 = 21

Fix Grandma’s Necklace

Help me put the beads on the necklace to complete it.

Thank You!

Make Your Necklace

You will get:

• 1 set of beads

• 2 different colors

• 1 string

Your necklace needs a total of 24 beads.

Each group has a different number of beads in their set.

Make Your Necklace

• Work in groups.

• Decide on a pattern using all the beads.

• Draw your pattern.

How Many More Do You Need?

• How many more sets do you need?

• How many more beads do you need?

Remember: You will need to write a…

PROPORTION

Proportion Review

Beads On Necklace Sets of Beads

I have a broken 24 bead necklace with three beads in a set.

How many more sets do I need?How many more beads do I need?

324__ 1__

?= 87 sets21 beads

Finish Your Necklace

Write & solve your proportion.

Show me.

Get your beads.

Finish your necklace.

Can You Match?Can you match the correct set to its

matching necklace?

How many SETS would there be on this 24 bead necklace?

Price Matters

Store A

$4 a pack

4 beads

Store B

$5 a pack

6 beads

Store C

$7 a pack

8 beads

Which store would you want to buy from? Why?

You want to make one more of this necklace for your friend.

How much will it cost you?

Calculate Cost

You want to make a 24 bead necklace.

Store A

$4 a pack

4 beads

Store B

$5 a pack

6 beads

Store C

$7 a pack

8 beads

Write a proportion to figure out how much 24 beads would cost.

Store A 4 beads$4

24 beads=$24

$24

Calculate Cost

You want to make a 24 bead necklace.

Store A

$4 a pack

4 beads

Store B

$5 a pack

6 beads

Store C

$7 a pack

8 beads

Write a proportion to figure out how much 24 beads would cost.

Store A

Store B24 beads=

$24 6 beads$5$20 $20

Calculate Cost

You want to make a 24 bead necklace.

Store A

$4 a pack

4 beads

Store B

$5 a pack

6 beads

Store C

$7 a pack

8 beads

Write a proportion to figure out how much 24 beads would cost.

Store A

Store B

Store C

8 beads$7

24 beads=$24

$20

$21$21