Question

find square of (81) using column method​

Answer 1

Answer:

9 raise upto power 2

Step-by-step explanation:

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Answer 2

Answer:

The square of 81 is 6561

Step-by-step explanation:

here a=8 and b=1

col-I     col-II         col-III

a²        2xaxb           b²

8²        2x8x1            1²

Underline the digit of b 2 ( in column III) and add its tens digit, if any, to 2 x a x b (in column III)

64        16+0=16       1

Underline the digit in column II and add the number formed by tens and other digit, if any, to a 2 in column I.

64+1      16+0=16        1

under the number in column I

65             16               1

Write the underlined digits from the unit digit.

The square of 81 is 6561