Question

Squares and square roots of numbers from 1 to 20

Answer 1

Answer:

Square of 1=1

Square of 2=4

Square of 3=9

square of 4=16

square of 5=25

square of 6=36

square of 7=49

square of 8=64

square of 9=81

square of 10=100

square of 11= 121

square of 12=144

square of 13=169

square of 14=196

square of 15=225

square of 16=256

square of 17=289

square of 18=324

square of 19=361

square of 20=400

Hope u get ur answer.

I haven't answered the square roots as some of them will come in decimal places.

Answer 2

To find the square multiply the number with itself like(5×5=25 the squre of 5),The simple method to find the value of √20 is to factorise the number under the root, i.e. 20.

The prime factorisation of 20 gives:

20 = 2 x 2 x 5 = 22 x 5

Thus, here we can see, 20 is not a perfect square, because we cannot pair digit 5 after factoring 20. Only 22 can be taken out of the root.

Hence, if we take the roots on both sides, we get;

√20 = √(2 x 2 x 5)

Here, we just have only one pair of numbers, which is 2. Therefore, taking it outside the root, we get;

√20 = 2√5

From the square root table, we know the value of √5 = 2.236

Hence,

√20 = 2 x 2.236

√20 = 4.472