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?

2 4 6

3 6 9

1 2 3 4 5 6 7 8 9 10

Dark ChocWhite Choc

Packets

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

8 10 12 14 16 18 20

27 302421181512

The first 3 packs have been recorded for you.

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.

5 10 15

4 8 12

1 2 3 4 5 6 7 8 9 10

Red

Purple

Packets

20 25 30 35 40 45 50

36 403228242016

The first 3 packs have been recorded for you.

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

Number of red balls in each pack.

Number of packs

Total number of red balls

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

6 12

4 8

1 2 10 20 100

Red

Purple

Packets

60 120

4040

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

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

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

6 X 20 = 120

Now work out how many purple balls there must be.6 X 10 = 60

6 X 100 = 600

600

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

400

Now try these questions on your own.

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?

Click again when you have worked out all your answers.

40

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

100

100

21