# Seed Packets - PowerPoint PPT Presentation

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Seed Packets. I am learning to solve simple ratio problems by repeated copying. Compare one amount to another. e.g. a packet of sweets contains 2 blue sweets for every 3 green sweets. 2:3.

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Seed Packets

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Seed Packets

I am learning to solve simple ratio problems by repeated copying.

Compare one amount to another.

e.g. a packet of sweets contains 2 blue sweets for every 3 green sweets.

2:3

Chocco biscuits contain 2 Dark Chocolate biscuits and 3 White Chocolate biscuits in every pack. Use this information and the table below to work out how many White Chocolate biscuits we will have if we buy ten packs?

7

8

9

10

1

2

3

4

5

6

Packets

The first 3 packs have been recorded for you.

2

4

6

Dark Choc

10

12

14

16

18

20

8

3

6

9

White Choc

12

15

18

21

24

27

30

Complete the Dark Chocolate line of the table by recoding how many dark chocolate biscuits we will have in total with every extra pack.

Now complete the White Chocolate line of the table.

You can see that if we had ten packs of biscuits we would have 20 Dark Chocolate biscuits and 30 White Chocolate Biscuits.

The ratio of Dark Chocolate to White chocolate biscuits is 2: 3

A school has 10 packs of tennis balls. 5 tennis balls in each pack are red and 4 in each pack are purple. Use this information to complete the table below.

7

8

9

10

1

2

3

4

5

6

Packets

The first 3 packs have been recorded for you.

5

10

15

Red

25

30

35

40

45

50

20

4

8

12

Purple

16

20

24

28

32

36

40

Can you think of a way we could quickly work out how many red tennis balls there are in ten packs if we know the ration of red balls to purple to ball is 5:4?

5 X 10 = 50

Total number of red balls

Number of red balls in each pack.

Number of packs

Now let’s try and example without a full table.

The ratio of red tennis balls to purple tennis balls is 6:4

1

2

10

20

100

Can you think of how we can work out how many red tennis balls there will be in ten packs without adding sixes?

Packets

6

12

Red

600

60

120

4

8

Purple

400

40

40

6 X 10 = 60

Now work out how many purple balls there must be.

How can we work out how many red tennis balls there must be in 20 packs and 100 packs.

6 X 100 = 600

6 X 20 = 120

Now work out how many purple tennis balls there must be in 20 packs and 100 packs.

Now try these questions on your own.

Click again when you have worked out all your answers.

1) Every container has 3 red balls and 2 green balls. There are 20 containers. How many green balls are there in total?

2) Every container has 2 red balls and 5 green balls. There are 20 containers. How many green balls are there in total?

3) Every container has 1 red balls and 4 green balls. There are 25 containers. How many green balls are there in total?

4) Every container has 6 red balls and 3 green balls. There are 7 containers. How many green balls are there in total?

40

100

100

21

Need some more practise? Try Pg24 & 25 of Teacher Tools Fractions, Decimals and Percentages Book Numeracy resources