**Given∶**

A natural number 57.

**Formula Used∶**

By using the identify (a + b)^{2} = a^{2 }+ 2ab + b^{2}

**Calculation∶**

Step 1 ∶ Split 57 as 5 and 7

Step 2 ∶ Use the formula (a + b)^{2} = a^{2} + 2ab + b^{2 }Here, (5 + 7)^{2} = 5^{2} + 2 × 5 × 7 + 7^{2}

Without considering the plus sign, write the numbers as shown below 25 + 70 + 49

Step 1 ∶ Write down 9 from 49 and carry 4 to 70 [-----9 ]

Step 2 ∶ After adding 4 to 0, we get 4. Therefore, write down 4 [------49]

Step 3 ∶ Now add 5 and 7, we get 12, write down 2 and carry 1

Step 4 ∶ Finally write the answer along with (2 + 1 = 3) = 3249.

**∴ The square of 57 is 3249.**