# Key stage 3 Algebra

Term
A number or a constant, eg x or 4y
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Expression
A combination of terms, eg 3f+4
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Equation
Two expressions separated by an equals sign
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Formula
Like an equation but having more than 1 variable
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Identity
An equation that is true, regardless of what values are chosen
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Variable
A letter used to represent a number
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constant
a single number in an expression or equation
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collectliketerms
To put terms that are the same together, eg 2x + x = 3x
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unliketerms
terms that cannot be added together, eg 2x + 2y is not 2xy
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coefficient
a number multiplied by a constant, eg 2x or 5g
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exponent
A power eg, squared or cubed or a square root
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solve
To find the value of a variable in an equation
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Expand
To multiply out brackets
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Factorise
To put brackets into an expression
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sequence
an ordered set of numbers,eg 1, 4, 9, 16, 25, 36
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## Other cards in this set

### Card 2

Expression

#### Back

A combination of terms, eg 3f+4

Equation

Formula

Identity