How to calculate the square of 99.8 with perfect square

How to calculate the square of 99.8 with perfect square


=Square of (100) - square of 0.2



Calculate 99 square + 9999
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99²+9999
=99×99+99×101
=99×(101+99)
=19800



1*1=1 11*11=121 111*111=12321…… How did you figure it out


That's how it's calculated to find the law,
1111^1111=1234321