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Decimal
Counting in tens, and writing down numbers in groups of ten is called decimal. It is called base10. This means 9 is the highest digit you can go to in a column before you need to add another column. A digit is what we call the written symbol for the numerals zero to nine.
The ten digits in decimal
| Zero 0 | One 1 | Two 2 | Three 3 | Four 4 |
| Five 5 | Six 6 | Seven 7 | Eight 8 | Nine 9 |
Expanded value - Decimal
Break down of counting in decimals, we can easily read and calculate with decimal numbers because their place value is consistent, when a column is 'full' at nine, you reset that column to zero and add another column. 9 to 10, 99 to 100.
| 102 (10*10) | 101 (10*1) | 100 (1) | Expanded value of Decimal | Written numerals |
| 100s | 10s | 1s | ||
| 0 | 0 | 0 | 0 + 0 + 0 | Zero |
| 0 | 0 | 1 | 0 + 0 + 1 | One |
| 0 | 0 | 5 | 0 + 0 + 5 | Five |
| 0 | 1 | 1 | 0 + 10 + 1 | Eleven |
| 0 | 5 | 0 | 0 + 50 + 0 | Fifty |
| 0 | 9 | 4 | 0 + 90 + 4 | Ninety four |
| 1 | 1 | 1 | 100 + 10 + 1 | One Hundred and Eleven |
| 1 | 2 | 3 | 100 + 20 + 3 | One Hundred and Twenty Three |
| 6 | 7 | 9 | 600 + 70 + 9 | Six Hundred and Seventy Nine |