top

Counting by powers of ten
 Counting to ten billion... on your fingers "What order of magnitude is ...?" game Exponential Notation

"One, ten, hundred, thousand, ten thousand, hundred thousand, million, ten million, hundred million, billion, ..."

 One 100 1. "ten to the zero" ten 101 10. "ten to the one" hundred 102 100. "ten to the two" thousand 103 1,000. "ten to the three" ten thousand 104 10,000. "ten to the four" hundred thousand 105 100,000. "ten to the five" million 106 1,000,000. "ten to the six" ten million 107 10,000,000. "ten to the seven" hundred million 108 100,000,000. "ten to the eight" billion 109 1,000,000,000. "ten to the nine" ten billion 1010 10,000,000,000. "ten to the ten" hundred billion 1011 100,000,000,000. "ten to the eleven" trillion 1012 1,000,000,000,000. "ten to the twelve" ten trillion 1013 10,000,000,000,000. "ten to the thirteen" hundred trillion 1014 100,000,000,000,000. "ten to the fourteen"

Names are on threes... on 3, 6, 9 (thousand, million, billion). Each ,000,.

The names "billion" and "trillion" mean different things in different countries. This is the US version.
There are a few more names after "trillion", but they are almost never used.

IEER's Learning Common Prefixes. Includes SI prefixes.
Erik Max Francis's "A comprehensive table of all SI prefixes".

 A View from the Back of the Envelope Comments encouraged. - Mitchell N Charity

## Notes...

Some people count by `talking' the numbers, others by `seeing' them. (Source: Feynman's story (in "Curious Character"?)). You can try it and see. Counting "1, 2, 3, ...", are you saying "one, two, three", or are you picturing "1", "2", "3"? I say them, but sometimes practice picturing. Feynman reports that if you say them, you can read at the same time, but may have trouble talking. If you picture them, you can talk, but reading is difficult. Perhaps I should dig up the Feynman story and flesh this out as a page? It would also be nice to have a crosscheck on the concept.
```Notes:

Doables:

History: