Geometry / Mr. Hansen 2/7/2009 [rev. 2/10/09, 5/31/09, 4/14/17]

Name: _____________________________

33 Numb3rs You R3ally Ought to Know*

1 million  =  10^6  =	A thousand thousand	Prefix: mega
1 billion  =  10^9  =	A thousand million	giga
1 trillion  =  10^12  =	A thousand billion, or a million million	tera
1 quadrillion  =  10^15  =	A thousand trillion	peta
330 million	U.S. population
$4 trillion	U.S. federal budget, about $12,000 per capita
$3	Per capita value of a $1 billion U.S. government expenditure
7.5 billion	World population
4.3%	U.S. share of world population (OK to round to 5%, 1 in 20)
18%	U.S. share of world energy consumption (OK to round to 20%)
20 million	Daily U.S. oil consumption in barrels (approx. 800 million gallons)
36 billion	U.S. proven oil reserves in barrels, a 5-year supply for U.S.
1700 billion	World proven oil reserves in barrels, a 50-year supply for the world
$56,000	Per capita GDP (U.S.)
$10,000	Per capita GDP (world average)*
3.5 million	Land area (U.S.), square miles
57 million	Land area (world), square miles
$90 trillion	Total net worth of all U.S. households, 2016
$80-$90 billion	Net worth of Bill Gates
32	Number of years to equal 1 billion seconds (therefore, about 2800 years for the number of seconds equal to Bill Gates’ dollars)
80,000 lbs.  =  40 tons  =	Weight limit of a fully loaded semitrailer truck in the U.S.
5,280	Number of feet in a mile
3,280	Number of feet in a kilometer
60 mph  =	88 feet per second
40,000	Number of square feet in an acre (exact value is 43,560)
640  =	Number of acres in a square mile
6 · 10^27	Mass of the earth in grams
30 million  =  3 · 10^7	Number of seconds in a year (true value is about 31.6 million)
300 million  =  3 · 10^8	Speed of light (c) in meters per second (exact value is 299,792,458)
6,400 km or 4,000 miles	Radius of the earth
640,000 km or 400,000 miles	Radius of the sun**
1 A.U. or about 93 million miles	Distance from sun to earth (1 Astronomical Unit)
5 A.U.	Distance from sun to Jupiter
30 A.U.	Distance from sun to Neptune, the outermost “real planet”

Footnotes:

  * Most of these are rounded for convenience. It is usually more important to know the order of magnitude than the exact value.

  ** Actual value (2016) is $15,728 based on purchasing power, $10,138 based on nominal currency value.

  *** Note that since the sun is 100 times larger than the earth in linear dimension, the sun has about 10,000 times as much surface area (100²) and about 1 million times as much volume (100³).