Finding Square of a Number Using Identity

Q.

The sum of first $16$ odd numbers is equal to:

1. $225$

2. $64$

3. $32$

4. $256$

Q. What is the square of 1.2?

1. 144
2. 1.44
3. 0.144
4. 14.4

Q. Square of number 37 can be found in two steps.



What is a?

1. 75

2. 25

3. 50

4. 100

Q.

Use the short cut method to find $(110{)}^2$.

1. 12200

2. 12100

3. 13100

4. 12300

Q.

Use the short cut method to find $(97{)}^2$.

1. 9439

2. 9709

3. 9409

4. 6439

Q.

Solve $(ab+1{)}^2$ - $(ab{)}^2$ where, b - a = 1.

1. $a^2$ + $b^2$

2. $a^2$ + $(b+1{)}^2$

3. $(a+1{)}^2$ + $(b+1{)}^2$

4. $b^2$

Q.

The value of 21² is?

1. 220+221

2. 219+220

3. 218+219

4. 217+218

Q.

Find the square of 48.

1. 2284

2. 2304

3. 2464

4. 2364

Q. If $x^2+y^2=47$ and $xy=\frac{19}{2}$ then what is the value of $3(x+y{)}^2+(x-y{)}^2$?

1. 170
2. 270
3. 226
4. 86

Q. What are the last two digits in the square of 39?

1. 21
2. 31
3. 41
4. 11