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Today we will be... Exploring how different combinations of coins can make the same total
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Mental Oral Starter
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I have two coins.
I have three coins, so I have more money than you!
Is this correct?
Think, pair, then share your ideas.
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It could be correct...
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...or it could be incorrect...
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In fact, they both have the same amount of money – 25p. What coins must
they each have?
? ?
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Did you work out the correct coins?
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We're going to the stationery shop to buy some things we need for school!
Will you help us?
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35p 42p
Colouring Pencils
£1 and 5p
I want to buy the notepad and pen for 35p.
What coins can I use to pay for them exactly?
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35p
There are lots of different ways to make 35p exactly.
Here are some of them:
Did you think of a different way?
20p + 10p + 5p = 35p10p + 10p + 10p + 5p
= 35p5p + 5p + 5p + 5p + 5p + 5p + 5p = 35p
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35p 42p
I want to buy the paint set for 42p.
What coins can I use to pay for them exactly?
Colouring Pencils
£1 and 5p
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There are lots of different ways to make 42p exactly.
Here are some of them:
Did you think of a different way?
20p + 20p + 2p = 42p20p + 10p + 10p + 2p
= 42p10p + 10p + 10p +
10p + 1p + 1p = 42p
42p
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35p 42p
I want to buy the colouring pencils for £1 and 5p.
What coins can I use to pay for them exactly?
Colouring Pencils
£1 and 5p
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There are lots of different ways to make £1 and 5p exactly.
Here are some of them:
Did you think of a different way?
£1 + 5p = £1 and 5p50p + 50p + 2p + 2p
+ 1p = £1 and 5p20p + 20p + 20p + 20p +
20p + 5p = £1 and 5p
Colouring Pencils
£1 and 5p
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Now you know that different combinations of coins can be used to make the same total, let's play a game!
In pairs or small groups, spread out a set of the Which Coins? Cards in front of you so that everyone can see them.
Are you ready?!
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I have 18p in my purse. There is one 10p coin. There are no more than five coins in total.
What coins could I have?
18p
Use the Coin Cards to help you!
Can you find more than
one answer?
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I have 18p in my purse. There is one 10p coin. There are no more than five coins in total.
Here are the coins I have...
Did you find this combination of
coins?
How many other combinations did you find?
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I have 22p in my wallet. There is one 2p coin. There are no more than five coins in total.
What coins could I have?
Use the Coin Cards to help you!
Can you find more than
one answer?
22p
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I have 22p in my wallet. There is one 2p coin. There are no more than five coins in total.
Here are the coins I have...
Did you find this combination of
coins?
How many other combinations did you find?
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I have 50p in my piggy bank. I do not have a 50p coin. All of the coins are silver.
What coins could I have?
Use the Coin Cards to help you!
Can you find more than
one answer?
50p
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Did you find this combination of
coins?
How many other combinations did you find?
I have 50p in my piggy bank. I do not have a 50p coin. All of the coins are silver.
Here are the coins I have...
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I have 7p in my pocket. There are no silver coins. What coins could I have?
Use the Coin Cards to help you!
Can you find more than
one answer?
7p
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Did you find this combination of
coins?
How many other combinations did you find?
I have 7p in my pocket. There are no silver coins. Here are the coins I have...
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Now it's time for you to explore how different
combinations of coins can make the same totals
yourselves!
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Plenary
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22p
Which two coins could I use to pay
for this chocolate
bar exactly?
Which four coins could I use to pay
for this chocolate
bar exactly?
Which three coins could I use to pay for this chocolate
bar exactly?
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Plenary
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22p
Did you find all the combinations?