Suppose we have a number

  128

 

To write it as exponent,

we do it’s prime factorization

 

128 = 2 × 2 × 2 × 2 × 2 × 2 × 2

128 = 2 7

1.jpg

 

Similarly,

  For 243

243 = 3 × 3 × 3 × 3 × 3

243 = 3 5

 

3.jpg

For 625

625 = 5 × 5 × 5 × 5

625 = 5 4

4.jpg

 

For 18

18 = 2 × 3 × 3

18 = 2 × 3 2

 

  For 72

72 = 2 × 2 × 2 × 3 × 3

72 = 2 3 × 3 2

6.jpg

 

For 100

100 = 2 × 2 × 5 × 5

100 = 2 2 × 5 2

 

We can also write 100 as

  100 = 10 × 10 = 10 2

7.jpg

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

About the Author

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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.