# Revisiting place value

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You have done this quite earlier, and you will certainly remember the expansion of a 2-digit number like 78 as

**78** = **70** + **8** = **7** × **10** + **8**

Similarly, you will remember the expansion of a 3-digit number like 278 as

**278** = **200** + **70** + **8** = **2** × **100** + **7** × **10** + **8**

We say, here, **8** is at **7** is at **2** at

Later on we extended this idea to 4-digit numbers.

For example, the expansion of 5278 is

**5278** = **5000** + **200** + **70** + **8** = **5** × **1000** + **2** × **100** + **7** × **10** + **8**

Here, **8** is at **ones** place, **7** is at **tens** place, **2** is at **hundreds** place and **5** is at

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With the number 10000 known to us, we may extend the idea further. We may write 5-digit numbers like

**45278** = **(hint:Expanded form)**

= **4** × **10000** + **5 × 1000** + **2** × **100** + **7** × **10** + **8**

We say that here 8 is at ones place, 7 at tens place, 2 at hundreds place, 5 at thousands place and 4 at

The number is read as **forty five thousand, two hundred seventy eight**.

**Can you now write the smallest five digit number?**

**and now, the greatest 5-digit numbers?**

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**Choose the correct number names for the given number.**

Let's further work on the expansion of these numbers

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**Expand the numbers for the given numbers**

20000 = 2 × 10000

**26000 = 2 × 10000 + 6 × 1000**

38400 =

**65740 = 6 × + × 1000 + 7 × + 4 × **

89324 =

**50000 = 5 × **

41000 =

**47300 = × + × 1000 + × **

57630 = 5 ×

**29485 = × 10000 + × 1000 + × 100+ × 10 + × 1**

20005 =