Question

Compute the squares of these numbers in
head. 20 1/2
​

Answer 1

$(20)^{2}=400$ and $(\dfrac{1}{2})^{2}=\dfrac{1}{4}$

Step-by-step explanation:

The first number is 20.

To find the square of 20 (that is the value of 20 × 20) in mind, you have to go this way:

1. The product of 0 and 0 is 0 and nothing is carried.
2. The sum of the products of 2, 0 and 2, 0 is (2 × 0) + (2 × 0) = 0 + 0 = 0, and nothing is carried.
3. The product of 2 and 2 is 4.

So, we have our square as 400.

The second number is ½.

To find the square of ½ (that is the value of ½ × ½) in mind, you have to go this way:

1. Find the product of 1 and 1, that is 1, which is the resulting numerator.
2. Find the product of 2 and 2, that is 4, which is the resulting denominator.

So, we have our square as ¼.

#SPJ3

Answer 2

Answer:

The square of 20 is 400 and the square of 1/2 is 1/4.

Step-by-step explanation:

Square of 20 = (20)²

=20×20

In 20, 0 is in the ones place and 2 is in tens place.

1st Multiply the numbers other than 0 in 20 that means the numbers that are present in tens place which we get 2×2=4.

1st Multiply the numbers other than 0 in 20 that means the numbers that are present in tens place which we get 2×2=4. Then put two 0 which is present in ones place of 20.

Then we get 400.

square of 1/2= (1/2)²

=1/2×1/2

Here numerator is 1 and denominator is 2.

1st multiply the numerators of the both fractions 1/2 .

we get in numerator, 1×1=1

Then multiply the both denominator of the fraction 1/2.

then we get in denominator, 2×2=4

Then the fraction will be 1/4.