From place value of numbers,

we know that

10.jpg

Thousands

Hundreds

Tens

Ones

2 4 8 6

 

We write the number as

  2486 = 2 × 1000 + 4 × 100 + 8 × 10 + 6 × 1

  = 2 × 10 3 + 4 ×10 2 + 8 × 10 1 + 6 × 10 0

 

So, we can write any number as power of 10

 

For number,

11.jpg

Ten Thousands

Thousands

Hundreds

Tens

Ones

9 8 2 7 6

We write the number as

  98276 = 9 × 10,000 + 8 × 1,000 + 2 × 100 + 7 × 10 + 6 × 1

   = 9 × 10 4 + 8 × 10 3 + 2 × 10 2 + 7 × 10 1 + 6 × 10 0

 

For number,

13.jpg

Tens

Ones

2 8

We write the number as

      28 = 2 × 10 + 8 × 1

           = 2 × 10 1 + 8 × 10 0

 

For decimal number,

 

  849.58

 

In place value table

Hundreds

Tens

Ones

Decimal

Tenth

Hundredth

8 4 9 . 5 8

So, we write the number as

  849.58 = 8 × 100 + 4 × 10 + 9 × 1 + 5 × 1/10 + 8 × 1/100

    = 8 × 10 2 + 4 × 10 1 + 9 × 10 0 + 5 × 1/10 1  + 8 × 1/10 2  

                         = 8 × 10 2 + 4 × 10 1 + 9 × 10 0 + 5 × 10 -1 + 8 × 10 -2

 

For decimal number,

 

  29.0008

 

In place value table

Tens

Ones

Decimal

Tenth

Hundredth

thousandth

Ten Thousandt h

2 9 . 0 0 0 8

We write the number as;

29.0008 = 2 × 10 + 9 × 1 + 0 × 1/10 + 0 × 1/100 + 0 × 1/1000 + 8 × 1/10000

    = 2 × 10 1 + 9 × 10 0 + 0 × 10 -1 + 0 × 10 -2 + 0 × 10 -3 + 8 × 10 -4

     = 2 × 10 1 + 9 × 10 0 + 8 × 10 -4

  1. Chapter 13 Class 7 Exponents and Powers
  2. Concept wise

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.