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”).

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So we write:

10

12

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It says we have 1 Ten và 2 Ones, which makes 12.

This can also be written as 1 × 10 + 2 × 1.

3510

We have khổng lồ put a Zero in the Ones place or “10” looks lượt thích “1”.

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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:

1 4 3

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That shows we have 1 Hundred, 4 Tens và 3 Ones:

This can also be written as 1 × 100 + 4 × 10 + 3 × 1.

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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.