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We forgot to take the register for 7 Bruno on Tuesday! Oh no!
ππ’ππππ ππ ππ’ππππ πππ΅ππ’ππ=π
If everyone was here then π=ππIf there was only Β½ the class then π=ππ
TODAY β¦.. π=ΒΏ
ππ’ππππ ππ ππ’ππππ πππ΅ππ’ππ=π
However, tomorrow some pupils may be absent
so ββ can VARY (i.e. change) We call ββ a VARIABLE.
The number of FISH in a shoal is an UNKNOWN VALUE and can VARY.
πΏππ‘ π ππππππ πππ‘ hπ‘ πππ’ππππ ππ hπππ
π+π=πππ
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.
πΏππ‘ π ππππππ πππ‘ hπ‘ πππ’ππππ ππ π‘ππ₯π‘ πππππ .
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 canβt.
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.
πππ‘ππππ’ππππ ππ ππ’ππππ πππ΅ππ’ππ=π
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.
ππ’ππππ ππ ππ’ππππ πππ΅ππ’ππππ πβπ
πππ‘ππππ’ππππ ππ ππ’ππππ πππ΅ππ’ππ=π
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.
ππ’ππππ ππ ππ’ππππ πππ΅ππ’ππππ πβ10
πππ‘ππππ’ππππ ππ ππ’ππππ πππ΅ππ’ππ=π
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.
ππ’ππππ ππ ππ’ππππ πππ΅ππ’ππππ π+π
Suppose Simone has a packet of biscuits and she doesnβt 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 EXPRESSIONβ¦
πππ‘ππππ’ππππ ππ π΅ππ ππ’ππ‘π =π
b β 4
I think of a numberβ¦..
Let the letter represent my unknown number.
I then ADD 5 to my number.As an expressionβ¦.
π+π
I think of the number 12.
Let the letter represent a unknown number.
I then my unknown number to 12.
As an expressionβ¦.
ππ+π
I think of the number 50.
Let the letter represent a unknown number.
I then MINUS from 50.
As an expressionβ¦.
ππβπ
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.
ππ’ππππ ππ πππππππππ =π
π+π
The shopkeeper buys a box of 100 sweets.
Write an EXPRESSION for number of sweets.
ππ’ππππ ππ π π€πππ‘π =π
π+πππ
The shopkeeper sells penny sweets in a day.
Write an EXPRESSION for number of sweets.
ππ’ππππ ππ π π€πππ‘π =πππ
πππβ π
In one day New Look sold 89 pairs of jeans.
Write an EXPRESSION for number of pairs of jeans.
ππ’ππππ ππ πππππ ππ πππππ = π
πβππ
On Monday New Look had a delivery of pairs of jeans.
Write an EXPRESSION for number of pairs of jeans.
250
πππ+ π
I think of a numberβ¦..Let the letter represent my unknown number.
I then MULTIPLY my number by 2.As an expressionβ¦.
πΓπΒΏπ π
I think of a numberβ¦..Let the letter represent my unknown number.
I then MULTIPLY my number by 11As an expressionβ¦.
πΓππΒΏπππ
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?
πΓπΒΏπ π
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?
πΓπΒΏππ
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·πΒΏπ π
As an expression how pens does Mary have now?
πΓπΒΏππ
ππππ¦ hππ πππ‘π ππ ππππ ππ hππ πππππππππ 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 Γ·πΒΏ ππ
Akokor built a tower metres high.
She then decides to TRIPLE the height of her tower!
As an expression how high is Akokorβs tower?
πΓπΒΏπ π
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?
πΓπΒΏπ π
Chimezie has pairs of socks.
Penny has 4 TIMES as many pairs of socks.As an expression how many socks does Penny have?πΓπΒΏππ
Niamh has HALF as many pairs of socks as Chemizie?
As an expression how many socks does Niamh have?
πΓ·πΒΏππ
ALGEBRAIC EXPRESSION
WORDED EXPRESSION
ALGEBRAIC EXPRESSION
WORDED EXPRESSION
Georgia went Strawberry picking one summer. hπ πππππππππ π‘πππ€πππππππ
She ate 10 strawberries at Lunch. How many strawberries
does she have now?
Sian also went Strawberry picking with Georgia.ππππππππππππ π‘πππ€πππππππ
Sian then picked 20 more strawberries.
How many strawberries does she have now?
- 10
+ 20
Sonya and Madalena went Strawberry picking too
ππππ¦ππππππππ π π‘πππ€πππππππ ππππππππππππππππ π‘πππ€πππππππ How many strawberries does do
they have altogether?
ππ π‘πππ€πππππππ ππ π‘πππ€πππππππ ++
=π+π
