Page 9 - Mathematics Class - IX

CONVERSIONS

For Length: For Area:
10 mm = 1 cm 100 mm = 1 cm 2
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10 cm = 1 dm 100 cm = 1 dm 2
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10 dm = 1 m 100 dm = 1 m 2
10 m = 1 dam (decameter) 100 m = 1 dam 2
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10 dam = 1 hm (hectometer) 100 dam 2 = 1 hm 2
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10 hm = 1 km 100 hm = 1 km 2
1 hectare (1 ha) = 100 × 100 m = 10,000 m 2
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For Volume:
1 m = 100 cm × 100 cm × 100 cm = 10 cm , 1 cm = 1000 mm 3
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1 cm = 1 mL 1 m = 1000 litres = 1 kL
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1 L = 1000 cm = 1 dm 3
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USEFUL MATHEMATICAL SYMBOLS

Symbol Meaning Symbol Meaning
+ Plus or add % Per Cent

– Minus or subtract o Degree
 Plus or minus II Is parallel to
× Multiply or times  Is perpendicular to
÷ Divide ~ Is related to
≠ Is not equal to  Is congruent to

< Is less than — Line segment
> Is greater than  Ray
 Is less than or equal to  Line
 Is greater than or equal to  Angle

<> Is less than or greater than
 Is approximately equal to m Measure of angle
: Is in proportion  Triangle
 Therefore ( ) Parentheses

 Positive square root [ ] Brackets
a b Exponential form { } Braces
 Similar to  Pi

 Theta  Alpha
 Sigma  Beta

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