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This one of several cool little documents I used when teaching math.  I was also the de facto computer teacher for the middle grades and they came in handy there too.  The other documents are also posted on the home page of the For Teachers section.

This chart is a great visual reference combining and comparing numbers in exponential form, standard form, decimals and words.  It ties in nicely with the other documents. It exposes students to unfamiliar terms and concepts, such as negative exponents and the word form of amazingly large and small numbers.

Like the others, I'm not sure where I got them but they have been useful over the years.

Note the numbers in the "Since" column, which get more recent as the numbers get bigger and smaller.  If you're wondering where those weird prefixes come from, see the Origin of units page.

 
1000m 10n Prefix Symbol Since Word form Decimal
10008 1024 yotta Y 1991 Septillion 1000000000000000000000000
10007 1021 zetta Z 1991 Sextillion 1000000000000000000000
10006 1018 exa E 1975 Quintillion 1000000000000000000
10005 1015 peta P 1975 Quadrillion 1000000000000000
10004 1012 tera T 1960 Trillion 1000000000000
10003 109 giga G 1960 Billion 1000000000
10002 106 mega M 1960 Million 1000000
10001 103 kilo k 1795 Thousand 1000
10002⁄3 102 hecto h 1795 Hundred 100
10001⁄3 101 deca da 1795 Ten 10
10000 100 (none) (none) NA One 1
1000−1⁄3 10−1 deci d 1795 Tenth 0.1
1000−2⁄3 10−2 centi c 1795 Hundredth 0.01
1000−1 10−3 milli m 1795 Thousandth 0.001
1000−2 10−6 micro µ 1960 Millionth 0.000001
1000−3 10−9 nano n 1960 Billionth 0.000000001
1000−4 10−12 pico p 1960 Trillionth 0.000000000001
1000−5 10−15 femto f 1964 Quadrillionth 0.000000000000001
1000−6 10−18 atto a 1964 Quintillionth 0.000000000000000001
1000−7 10−21 zepto z 1991 Sextillionth 0.000000000000000000001
1000−8 10−24 yocto y 1991 Septillionth 0.000000000000000000000001