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Sharing in a Given RatioPowerPoint Presentation

Sharing in a Given Ratio

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Use this method to share the bar of chocolate below between Snoopy and Hippo in the ratio 2 : 7. How many pieces do they each receive?

Use this method to share the bar of chocolate below between Snoopy and Hippo in the ratio 2 : 7. How many pieces do they each receive?

Use this method to share the bar of chocolate below between Snoopy and Hippo in the ratio 2 : 7. How many pieces do they each receive?

Use this method to share the bar of chocolate below between Snoopy and Hippo in the ratio 2 : 7. How many pieces do they each receive?

Use this method to share the bar of chocolate below between Snoopy and Hippo in the ratio 2 : 7. How many pieces do they each receive?

Use this method to share the bar of chocolate below between Snoopy and Hippo in the ratio 2 : 7. How many pieces do they each receive?

### Examples 1/2

Simon and Jenny share the bar of chocolate in the ratio 5 : 3. How many pieces do they each receive?

This means that for every 5 pieces that Simon gets, Jenny gets 3.

We could share the 24 pieces between them until we run out of chocolate.

Simon and Jenny share the bar of chocolate in the ratio 5 : 3. How many pieces do they each receive?

This means that for every 5 pieces that Simon gets, Jenny gets 3.

We could share the 24 pieces between them until we run out of chocolate.

Simon and Jenny share the bar of chocolate in the ratio 5 : 3. How many pieces do they each receive?

This means that for every 5 pieces that Simon gets, Jenny gets 3.

We could share the 24 pieces between them until we run out of chocolate.

Simon and Jenny share the bar of chocolate in the ratio 5 : 3. How many pieces do they each receive?

This means that for every 5 pieces that Simon gets, Jenny gets 3.

We could share the 24 pieces between them until we run out of chocolate.

Simon and Jenny share the bar of chocolate in the ratio 5 : 3. How many pieces do they each receive?

This means that for every 5 pieces that Simon gets, Jenny gets 3.

We could share the 24 pieces between them until we run out of chocolate.

Simon and Jenny share the bar of chocolate in the ratio 5 : 3. How many pieces do they each receive?

This means that for every 5 pieces that Simon gets, Jenny gets 3.

We could share the 24 pieces between them until we run out of chocolate.

Simon and Jenny share the bar of chocolate in the ratio 5 : 3. How many pieces do they each receive?

This means that for every 5 pieces that Simon gets, Jenny gets 3.

We could share the 24 pieces between them until we run out of chocolate.

9

15

Use this method to share the bar of chocolate below between Snoopy and Hippo in the ratio 2 : 7. How many pieces do they each receive?

Use this method to share the bar of chocolate below between Snoopy and Hippo in the ratio 2 : 7. How many pieces do they each receive?

Use this method to share the bar of chocolate below between Snoopy and Hippo in the ratio 2 : 7. How many pieces do they each receive?

8

28

So Snoopy gets

of 80 = 48 pieces

5

2

Hippo gets

of 80 = 32 pieces

5

Sharing in a Given Ratio

Discuss the problem of using this method if Snoopy and Hippo had to share (the very nice) bar of chocolate below in the ratio 3 : 2.

5 x 16 = 80

So this method is not efficient when the quantity to be shared is large and/or the ratios are small. A more efficient method is desirable.

This can be achieved by considering what proportion/fraction of the whole bar they will each receive. In this example we can think of the bar as being divided into 5 parts.

Snoopy will get 3 out of 5 parts and Hippo will get 2 out 5 parts.

Check: 48 + 32 = 80

8 parts

2

5

3

Jenny gets

Hippo gets

of 56 = 16 discs

of £72 = £45

Simon gets

of £72 = £27

7

8

8

Example Question 2

Snoopy and Hippo share 56 coloured discs in the ratio of 5 : 2. How many do they each receive?

7 parts

5

Snoopy gets

of 56 = 40 discs

7

Sharing in a Given Ratio

Example Question 1

Simon and Jenny share £72 in the ratio of 3 : 5. How much do they each receive?

Check: 27 + 45 = 72

Check: 40 + 16 = 56

Questions 1

1. Share £48 between Alan and Barbara in the ratio 2 : 1

£16

£32

2. Share £60 between Laura and Robert in the ratio 1 : 3

£45

£15

3. Share 80 marbles between Stuart and Carl in the ratio 4 : 1

64

16

4. Share 91 sweets between Peter and Becky in the ratio 4 : 3

52

39

5. Share 70 coloured beads between Janet and Christine in the ratio 3 : 2

42

28

6. Share £120 between Carly and Paul in the ratio 3 : 5

£45

£75

Questions 2

1. Share 350 ml of milk between a cat and her kitten in the ratio 4 : 3

150 ml

200 ml

2. Share 1.2 litres of milk between a dog and a cat in the ratio 7 : 5

500 ml

700 ml

3. Share 240 g of sweets between Alison and Stephen in the ratio 3 : 5

150 g

90 g

4. Share 120 g of cereal between Stuart and Julie in the ratio 3 : 7

36 g

84 g

£2400

£3000

5. Paul is 12 and Gemma is 15. They share a £5400 inheritance from their aunty in the ratio of their ages. How much do they each receive?

£1275

£1445

6. John scored 15 points and Fiona scored 17 points in a TV quiz show. They shared the prize money of £2720 in ratio of points scored. How much did they each receive?

Example 3

8 parts

4

3

1

Ollie gets

Prof gets

of 64 = 24 cubes

of 64 = 32 cubes

Jumbo gets

of 64 = 8 cubes

8

8

8

Sharing in a Given Ratio

Example Question 3

Ollie, Jumbo and Prof break the large cube into individual small cubes and share them in the ratio 3 : 1 : 4. How many does each receive?

Check: 24 + 8 + 32 = 64

Example 4

20 parts

4

7

Snoopy gets

of 80 = 16 counters

Ollie gets

of 80 = 28 counters

20

20

3

6

Hippo gets

of 80 = 12 counters

Jumbo gets

of 80 = 24 counters

20

20

Sharing In a Given Ratio

Example Question 4

Snoopy, Ollie, Hippo and Jumbo share the coloured counters shown in the ratio 4 : 7 : 3 : 6. How many counters does each receive?

Check: 16 + 28 + 12 + 24 = 80

Questions 3

1. Alan, Becky and Charlie share 72 sweets in the ratio 2 : 3 : 4. How many sweets do they each receive?

Alan gets 16 sweets

Becky gets 24 sweets

Charlie gets 32 sweets

2. Paula, Robert and Karl share £240 in the ratio 4 : 5 : 3. How much money do they each receive?

Paula gets £80

Robert gets £100

Karl gets £60

3. A piece of wood 2.8 m long, is cut into 3 pieces in the ratio 4 : 3 : 7. Find the length of each piece.

Piece 1 = 80 cm

Piece 2 = 60 cm

Piece 3 = 140 cm

4. A metal alloy block of mass 56 kg consists of copper, zinc and tin in the ratio 4 : 3 : 1. Find the mass of each metal.

Copper = 28 kg

Zinc = 21 kg

Tin = 7 kg

5. Jack, Jenny, Paul and Kate share 720 marbles in the ratio 2 : 9 : 4 : 3. How much does each receive?

Kate gets 120

Jack gets 80

Jenny gets 360

Paul gets 160

Worksheet 1

Sharing in a Given Ratio

Questions 1

1. Share £48 between Alan and Barbara in the ratio 2 : 1

2. Share £60 between Laura and Robert in the ratio 1 : 3

3. Share 80 marbles between Stuart and Carl in the ratio 4 : 1

4. Share 91 sweets between Peter and Becky in the ratio 4 : 3

5. Share 70 coloured beads between Janet and Christine in the ratio 3 : 2

6. Share £120 between Carly and Paul in the ratio 3 : 5

Worksheet 2

Sharing in a Given Ratio

Questions 2

1. Share 350 ml of milk between a cat and her kitten in the ratio 4 : 3

2. Share 1.2 litres of milk between a dog and a cat in the ratio 7 : 5

3. Share 240 g of sweets between Alison and Stephen in the ratio 3 : 5

4. Share 120 g of cereal between Stuart and Julie in the ratio 3 : 7

5. Paul is 12 and Gemma is 15. They share a £5400 inheritance from their aunty in the ratio of their ages. How much do they each receive?

6. John scored 15 points and Fiona scored 17 points in a TV quiz show. They shared the prize money of £2720 in ratio of points scored. How much did they each receive?

Worksheet 3

Sharing in a Given Ratio

Questions 3

1. Alan, Becky and Charlie share 72 sweets in the ratio 2 : 3 : 4. How many sweets do they each receive?

2. Paula, Robert and Karl share £240 in the ratio 4 : 5 : 3. How much money do they each receive?

3. A piece of wood 2.8 m long, is cut into 3 pieces in the ratio 4 : 3 : 7. Find the length of each piece.

4. A metal alloy block of mass 56 kg consists of copper, zinc and tin in the ratio 4 : 3 : 1. Find the mass of each metal.

5. Jack, Jenny, Paul and Kate share 720 marbles in the ratio 2 : 9 : 4 : 3. How much does each receive?

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