Ma'am, there's a method of evaluating squares of any no. b/w 30-60 which is pretty easy.. Consider a number b/w 30-60 ..let it be 45.. now we subtract the chosen no. from 50..
45-50= -5
now we square it and these 2 digits will occupy the units and tens place.
i.e ??25
For the rest 2 digits, we add the difference to 25.
25+(-5)=20
now we place all the digits in order to get the square..
i.e. 2025=45^2 similarly it is valid for any digit between 30 to 60 eg: (56)^2 = ????
56-50=6 ???? 6^2=36 ??36 25+6=31 3136 so (56)^2 = 3136
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ReplyDeleteMa'am, there's a method of evaluating squares of any no. b/w 30-60 which is pretty easy..
ReplyDeleteConsider a number b/w 30-60 ..let it be 45..
now we subtract the chosen no. from 50..
45-50= -5
now we square it and these 2 digits will occupy the units and tens place.
i.e ??25
For the rest 2 digits, we add the difference to 25.
25+(-5)=20
now we place all the digits in order to get the square..
i.e. 2025=45^2
similarly it is valid for any digit between 30 to 60
eg: (56)^2 = ????
56-50=6 ????
6^2=36 ??36
25+6=31 3136
so (56)^2 = 3136
Good, keep it up.
Delete