Algebraic Expressions

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We forgot to take the register for 7 Bruno on Tuesday! Oh no!

π‘π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ 𝑝𝑒𝑝𝑖𝑙𝑠 π‘–π‘›π΅π‘Ÿπ‘’π‘›π‘œ=𝒑

If everyone was here then 𝒑=πŸ‘πŸŽIf there was only Β½ the class then 𝒑=πŸπŸ“

TODAY ….. 𝒑=ΒΏ

π‘π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ 𝑝𝑒𝑝𝑖𝑙𝑠 π‘–π‘›π΅π‘Ÿπ‘’π‘›π‘œ=𝒑

However, tomorrow some pupils may be absent

so β€˜β€™ can VARY (i.e. change) We call β€˜β€™ a VARIABLE.

The number of FISH in a shoal is an UNKNOWN VALUE and can VARY.

𝐿𝑒𝑑 𝒇 π‘Ÿπ‘’π‘π‘Ÿπ‘’π‘ π‘’π‘›π‘‘ h𝑑 π‘’π‘›π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ h𝑓𝑖𝑠

𝒙+π’š=𝟏𝟎𝟎

The numbers for this SUM are UNKNOWN VALUES and can VARY.

The number of text books in school Is an UNKNOWN VALUE and can VARY.

𝐿𝑒𝑑 𝒕 π‘Ÿπ‘’π‘π‘Ÿπ‘’π‘ π‘’π‘›π‘‘ h𝑑 π‘’π‘›π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ 𝑑𝑒π‘₯𝑑 π‘π‘œπ‘œπ‘˜π‘  .

In algebra, we use letter symbols to stand for numbers.

These letters are called unknowns or variables.

Sometimes we can work out the value of the letters and sometimes we can’t.

We can use algebra to help us solve problems by making up algebraic expressions and

equations using the letters to represent the unknown value or variable.

π‘‡π‘œπ‘‘π‘Žπ‘™π‘π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ π‘π‘’π‘π‘–π‘™π‘ π‘–π‘›π΅π‘Ÿπ‘’π‘›π‘œ=𝒑

How can I write the total number of pupils in Bruno NOW?

What would happen if I sent 2 pupils outside?

FOR EXAMPLE,

There were pupils now 2 pupils have gone.

π‘π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ 𝑝𝑒𝑝𝑖𝑙𝑠 π‘–π‘›π΅π‘Ÿπ‘’π‘›π‘œπ‘–π‘ π’‘βˆ’πŸ

π‘‡π‘œπ‘‘π‘Žπ‘™π‘π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ π‘π‘’π‘π‘–π‘™π‘ π‘–π‘›π΅π‘Ÿπ‘’π‘›π‘œ=𝒑

How can I write the total number of pupils in Bruno NOW?

What would happen if I sent 10 pupils outside?

FOR EXAMPLE,

There were pupils now 10 pupils have gone.

π‘π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ 𝑝𝑒𝑝𝑖𝑙𝑠 π‘–π‘›π΅π‘Ÿπ‘’π‘›π‘œπ‘–π‘ π’‘βˆ’10

π‘‡π‘œπ‘‘π‘Žπ‘™π‘π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ π‘π‘’π‘π‘–π‘™π‘ π‘–π‘›π΅π‘Ÿπ‘’π‘›π‘œ=𝒑

How can I write the total number of pupils in Bruno NOW?

What would happen if 5 pupils joined our class?

FOR EXAMPLE,

There were pupils and now there are 5 MORE.

π‘π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ 𝑝𝑒𝑝𝑖𝑙𝑠 π‘–π‘›π΅π‘Ÿπ‘’π‘›π‘œπ‘–π‘ π’‘+πŸ“

Suppose Simone has a packet of biscuits and she doesn’t know how many biscuits it contains.

At break Simone opens the packet and eats 4 biscuits, she can write an expression for the number of biscuits left:

WRITING AN ALGEBRAIC EXPRESSION…

π‘‡π‘œπ‘‘π‘Žπ‘™π‘π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ 𝐡𝑖𝑠𝑐𝑒𝑖𝑑𝑠=𝒃

b – 4

I think of a number…..

Let the letter represent my unknown number.

I then ADD 5 to my number.As an expression….

π’Œ+πŸ“

I think of the number 12.

Let the letter represent a unknown number.

I then my unknown number to 12.

As an expression….

𝟏𝟐+𝒙

I think of the number 50.

Let the letter represent a unknown number.

I then MINUS from 50.

As an expression….

πŸ“πŸŽβˆ’π’‚

I go to the supermarket and buy a pack of 5 ice creams and put them

in my freezer.Write an EXPRESSION for number of

ice creams.

π‘π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ π‘–π‘π‘’π‘π‘Ÿπ‘’π‘Žπ‘šπ‘ =π’š

π’š+πŸ“

The shopkeeper buys a box of 100 sweets.

Write an EXPRESSION for number of sweets.

π‘π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ 𝑠𝑀𝑒𝑒𝑑𝑠=𝒔

𝒔+𝟏𝟎𝟎

The shopkeeper sells penny sweets in a day.

Write an EXPRESSION for number of sweets.

π‘π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ 𝑠𝑀𝑒𝑒𝑑𝑠=πŸ’πŸŽπŸŽ

πŸ’πŸŽπŸŽβˆ’ 𝒔

In one day New Look sold 89 pairs of jeans.

Write an EXPRESSION for number of pairs of jeans.

π‘π‘’π‘šπ‘π‘’π‘Ÿ π‘œπ‘“ π‘π‘Žπ‘–π‘Ÿπ‘ π‘œπ‘“ π‘—π‘’π‘Žπ‘›π‘ = 𝒋

π’‹βˆ’πŸ–πŸ—

On Monday New Look had a delivery of pairs of jeans.

Write an EXPRESSION for number of pairs of jeans.

250

πŸπŸ“πŸŽ+ 𝒋

I think of a number…..Let the letter represent my unknown number.

I then MULTIPLY my number by 2.As an expression….

π’šΓ—πŸΒΏπŸ π’š

I think of a number…..Let the letter represent my unknown number.

I then MULTIPLY my number by 11As an expression….

π’‘Γ—πŸπŸΒΏπŸπŸπ’‘

Kerrie is on a game show and has won Β£

She then takes a chance and DOUBLES her money !

As an expression how much money has she won?

πŸΓ—π’™ΒΏπŸ 𝒙

Anjelica is on a game show and has won Β£

She then takes a chance and TRIPLES her money !

As an expression how much money has she won?

πŸ‘Γ—π’ŽΒΏπŸ‘π’Ž

Nicole is on a game show and has won Β£

Unfortunately she takes a chance but loses so HALVES her

money!As an expression how much money has she won?

π’…Γ·πŸΒΏπ’…πŸ

As an expression how pens does Mary have now?

πŸΓ—π’‘ΒΏπŸπ’‘

π‘€π‘Žπ‘Ÿπ‘¦ hπ‘Žπ‘  π‘™π‘œπ‘‘π‘ π‘œπ‘“ 𝑝𝑒𝑛𝑠𝑖𝑛 hπ‘’π‘Ÿ π‘π‘’π‘›π‘π‘–π‘™π‘π‘Žπ‘ π‘’ .What letter could we use to represent the

number of pens Mary has?

Maia then gives Mary her pens so Mary has DOUBLE the number of pens.

As an expression how pens does Mary have now?

Mary lends HALF her pens to Sian.

π’˜ ÷𝟐¿ π’˜πŸ

Akokor built a tower metres high.

She then decides to TRIPLE the height of her tower!

As an expression how high is Akokor’s tower?

πŸ‘Γ—π’›ΒΏπŸ‘ 𝒛

Dabby has Β£ in her wallet.

Ciara has 5 TIMES as much money in her wallet.

As an expression how much money does Ciara have?

πŸ“Γ—π’™ΒΏπŸ“ 𝒙

Chimezie has pairs of socks.

Penny has 4 TIMES as many pairs of socks.As an expression how many socks does Penny have?πŸ’Γ—π’‰ΒΏπŸ’π’‰

Niamh has HALF as many pairs of socks as Chemizie?

As an expression how many socks does Niamh have?

π’‰Γ·πŸΒΏπ’‰πŸ

ALGEBRAIC EXPRESSION

WORDED EXPRESSION

ALGEBRAIC EXPRESSION

WORDED EXPRESSION

  

  

  

  

 

Georgia went Strawberry picking one summer. h𝑆 π‘’π‘π‘–π‘π‘˜π‘’π‘‘π’Žπ‘ π‘‘π‘Ÿπ‘Žπ‘€π‘π‘’π‘Ÿπ‘Ÿπ‘–π‘’π‘ 

She ate 10 strawberries at Lunch. How many strawberries

does she have now?

Sian also went Strawberry picking with Georgia.π‘†π‘–π‘Žπ‘›π‘π‘–π‘π‘˜π‘’π‘‘π’π‘ π‘‘π‘Ÿπ‘Žπ‘€π‘π‘’π‘Ÿπ‘Ÿπ‘–π‘’π‘ 

Sian then picked 20 more strawberries.

How many strawberries does she have now?

- 10

+ 20

Sonya and Madalena went Strawberry picking too

π‘†π‘œπ‘›π‘¦π‘Žπ‘π‘–π‘π‘˜π‘’π‘‘π’Ž π‘ π‘‘π‘Ÿπ‘Žπ‘€π‘π‘’π‘Ÿπ‘Ÿπ‘–π‘’π‘ π‘€π‘Žπ‘‘π‘Žπ‘™π‘’π‘›π‘Žπ‘π‘–π‘π‘˜π‘’π‘‘π’π‘ π‘‘π‘Ÿπ‘Žπ‘€π‘π‘’π‘Ÿπ‘Ÿπ‘–π‘’π‘ How many strawberries does do

they have altogether?

π’Žπ‘ π‘‘π‘Ÿπ‘Žπ‘€π‘π‘’π‘Ÿπ‘Ÿπ‘–π‘’π‘  π’π‘ π‘‘π‘Ÿπ‘Žπ‘€π‘π‘’π‘Ÿπ‘Ÿπ‘–π‘’π‘ ++

=π’Ž+𝒏

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