Scientific notation and metric prefixes

Table 6: Numbers greater than or equal to one
Description Scientific notation Equivalent value SI prefix Abbreviation
One quadrillion1×10151,000,000,000,000,000petaP
One trillion1×10121,000,000,000,000teraT
One billion1×1091,000,000,000gigaG
One hundred million1×108100,000,000 
Ten million1×10710,000,000 
One million1×1061,000,000megaM
One hundred thousand1×105100,000 
Ten thousand1×10410,000
One thousand1×1031,000kilok
One hundred1×102100hectoh
Ten1×10110deca (deka)da
One1×1001
Table 7: Numbers less than one
Description Scientific notation Equivalent value SI prefix Abbreviation
One tenth1×10−10.1decid
One hundredth1×10−20.01centic
One thousandth1×10−30.001millim
One ten thousandth1×10−40.0001
One hundred thousandth1×10−50.00001
One millionth1×10−60.000001microμ
One ten millionth1×10−70.0000001
One hundred millionth1×10−80.00000001
One billionth1×10−90.000000001nanon
One trillionth1×10−120.000000000001picop
One quadrillionth1×10−150.000000000000001femtof

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