# Maths Flashcards

Equation
In equations a letter represnts a specific unknown number to be found. For example: 5x=20
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Identity
An identity is true for all vlaues of the letters used and is used when writing expressions more simply. For example: x+x=2x
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Formula
A formula is used when we need to substitute different values of a variable.For example: ∏r^2
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Expression
Expressions can be simplified by collecting like terms or using powers. For example: 2x+x simplifies to 3x
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1g=?mg
1g=1000mg
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1kg=?g
1kg=1000g
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1 tonne=?kg
1 tonne=1000kg
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1 litre= ?ml
1 litre=1000ml
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1ml= ?cm^3
1ml=1cm^3
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1 foot=? inches
1 foot= 12 inches
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1 yard=?feet
1 yard=3 feet
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1 pound(lb) =?ounces
1 pound(lb) =16 ounces
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1 stone=?pounds
1 stone= 14 pounds
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1 gallon=?pints
1 gallon=8 pints
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1 foot=?cm
1 foot=30cm
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1 mile=?km
1 mile=1.6km
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5 miles=?km
5 miles=8km
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3 feet=?metre
3 feet+1 metre
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1kg=?lb
1kg=2.2lb
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1lb=?kg
1lb=0.5kg
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2 pints=?litre
2 pints=1 litre
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1 gallon=?litres
1 gallon= 4.5 litres
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Covert 455mm to m
1m=100mm 455/1000=0.455m
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Convert 4.63 tonnes into kg
1 tonne=1000kg 4.63x1000=4630kg
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Covert 19 pints to gallons
1 gallon=8pints 19/8=2.375gallons or 2 gallons and 3 pints
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Convert 15miles into km
5 miles=8km 15 miles=3x8=24km
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## Other cards in this set

### Card 2

Identity

#### Back

An identity is true for all vlaues of the letters used and is used when writing expressions more simply. For example: x+x=2x

Formula

Expression

1g=?mg