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?
Packets
Dark
Choc
White
Choc
6
7
8
9
10
1
2
3
4
5
2
4
6
8
10 12 14 16 18 20
3
6
9
12
15 18 21 24 27 30
The first 3 packs
have been recorded
for you.
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.
Packets
1
2
3
Red
5
10 15
Purple
4
8
4
5
6
7
8
9
10
20 25 30 35 40 45 50
12 16
20 24 28 32 36 40
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.
Total number of red balls
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
Packets
1
2
Red
6
12 60 120 600
Purple
4
8
6 X 10 = 60
10 20
100
40 40 400
Can you think of how we can work
out how many red tennis balls
there will be in ten packs without
adding sixes?
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 20 = 120
6 X 100 = 600
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?
40
2) Every container has 2 red balls and 5 green balls. There are
20 containers. How many green balls are there in total?
100
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?
100
21
Need some more practise? Try Pg24 & 25 of Teacher Tools Fractions,
Decimals and Percentages Book Numeracy resources