The Ten Digits
The Digits we use today are called “Hindu-Arabic Numerals”:
We can use these on their own to lớn count up to 9:
0 | |
1 | |
2 | |
3 | |
4 | |
5 | |
6 | |
7 | |
8 | |
9 | |
?? |
But what happens after 9?
Ten Or More …
When we have more than 9 items, we start another column – the “tens” column – and we write down how many “tens” we have, followed by how many “ones” (also called “units”).
Bạn đang xem: Place value là gì
So we write:
10 |

It says we have 1 Ten và 2 Ones, which makes 12.
This can also be written as 1 × 10 + 2 × 1.
We have khổng lồ put a Zero in the Ones place or “10” looks lượt thích “1”.

A Hundred Or More …
When we have more than 99 items, we start another column – the “hundreds” column. Now we need lớn show how many Hundreds, Tens và Ones:

That shows we have 1 Hundred, 4 Tens và 3 Ones:
This can also be written as 1 × 100 + 4 × 10 + 3 × 1.
Xem thêm: Giải Bài Tập Đại Cương Về Đường Thẳng Và Mặt Phẳng Môn Toán Hình Học Lớp 11

Example: “369” means 3 Hundreds, 6 Tens and 9 Ones
Which is also 3 × 100 + 6 × 10 + 9 × 1
And So On …
Each time we want to lớn show a bigger number we just địa chỉ cửa hàng one column to the left and we know it is always 10 times bigger than than the column on its right.