Number Facts
Historical number facts
- Ancient Greeks numbered their armies by the Myriad (= ten thousand).
- In the 1500’s Italian bankers invented the word million. It was short for mille mille (thousand thousand).
- The French later invented the work billion.
- There are about a septillion atoms in a glass of water.
- The sun weighs a little less than two decillion grams.
- A really big number was named by a nine year old boy when his uncle a mathematician, asked him to think of a name for the number one, followed by 100 zeroes. The name he invented was a googol.
Numeral words:
| zero | eleven | ten | thousand |
| one | twelve | twenty | million |
| two | thirteen | thirty | billion |
| three | fourteen | forty | trillion |
| four | fifteen | fifty | quadrillion |
| five | sixteen | sixty | quintillion |
| six | seventeen | seventy | sextillion |
| seven | eighteen | eighty | septillion |
| eight | nineteen | ninety | octillion |
| nine | hundred | nonillion | |
| decillion |
Written Numerals:
| 6 | six |
| 72 | seventy - two |
| 45 | forty - five |
| 107 | one hundred seven |
| 1,006 | one thousand, six |
| 1,326 | one thousand, three hundred twenty - six |
| 1,165.14 | one thousand, one hundred sixty - five and fourteen hundredths |
| 5,426,384 | five million, four hundred twenty - six hundred thousand, three hundred eighty - four |
| 34.81 | thirty - four and eighty - one hundredths |
| $9.67 | nine dollars and sixty - seven cents |
| 8.19 | eight and nineteen hundredths |
| 74.11/32 | seventy - four and eleven thirty - seconds |
| 100.2 | one hundred and two tents |
| 104.005 | one hundred four and five thousandths |