**Algebraic Notation**

Activity

Sort the cards into expressions, equations and formula.

How are expressions used?

Expression

2x + 1

Understanding Letters

x + 3 = 5

x + 3 = y

1

x

Understand the different roles that letter play in

maths and

= 0

Decoding Expressions

A number:

A number add 2:

A number times 2:

A number subtract 2:

A number subtracted from 2:

A number divided by 2:

A number divided into 2:

A number squared:

n

n+2

2n

n-2

2-n

n

2

2

n

n

2

Decoding Expressions

4p - 2 means "p...........4 then .............2."

2 - 4q means "q..........-4 then ............2."

4(3x + 5) means "x .......... 3 then ..........5

then ............4 then ............ 7."

7

Decoding Expressions

4p - 2 means "p.times.4 then .subtract. 2."

2 - 4q means "q .times. -4 then .add. 2."

4(3x + 5) means "x .times. 3 then .add. 5

then .times. 4 then .divide by. 7."

7

Decoding expressions

Fill in the blank spaces to describe the expressions.

Equation

2x + 1 = 7, 2x + 1 = x + 3

Formula

2x + 1 = y

Sequence

3, 5, 7, 9, 11, ...

Function

f(x) = 2x + 1

Set equal to a value or another expression with the same letter.

Set equal to a different letter

Work it out when x = 1, 2, 3, 4, 5, ...

Set equal to f(x)

Decoding expressions

Work together to fill in the blank spaces.

(a) times, add

(b) times, subtract

(c) divided by, add

(d) subtract, divided by

(e) add, times

(f) times, add

(g) times, subtract, times

(h) times, subtract, divide

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