*1. Square of the number whose all digits are 1.*
First let us check that how many times 1 is appeared,
suppose 1 is appeared n times, so now start to write 1 to n in increasing order
and then from n write in the decreasing order upto 1.

**General Formula-**

(111111……..upto n)^2 =12345…………..n………………..54321

**Examples-**

**• (1)^2 = 1**

**• (11)^2 = 121**

**• (111)^2 = 12321**

**• (1111)^2 =1234321**

**• (11111)^2 =123454321**

**• (111111)^2 =12345654321**

**• (1111111)^2 =1234567654321**

**• (11111111)^2 =123456787654321**

**• (111111111)^2 =12345678987654321**

*2. Square of the number whose all digits are 3.*
First let us check that how many times 3 is appeared,
suppose 3 is appeared 3 times, so now start to write (3-1=2) times 1 and then 0
and then (3-1=2) times 8 and then 9 i.e. (333)^2 =110889.

**More Examples-**

**• (3)^2 = 9**

**• (33)^2 =1089**

**• (333)^2 =110889**

**• (3333)^2 =11108889**

**• (33333)^2 =1111088889**

**• (333333)^2 =111110888889**

**• (3333333)^2 =11111108888889**

**• (33333333)^2 =1111111088888889**

*3. Square of the number whose all digits are 9.*
First let us check that how many times 9 is appeared,
suppose 4 is appeared 5 times, so now start to write (5-1=4) times 9 and then 8
and then (5-1=4) times 0 and then 1 i.e. (99999)^2 =9999800001.

**More Examples-**

**• (9)^2 = 81**

**• (99)^2 =9801**

**• (999)^2 =998001**

**• (9999)^2 =99980001**

**• (99999)^2 =9999800001**

**• (999999)^2 =999998000001**

**• (9999999)^2 =99999980000001**

**• (99999999)^2 =9999999800000001**

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