calculations can be done fast by using simple tricks such as
squaring any number whose unit digit is 5
so the method is:
for example we are squaring 25 you all know the square so it's unit digit is 5
hence last two digit of this square is2 and 5 for finding first digit we multiply 2("because it is first digit of 25") by the consecutive number which is 3 so no. will be 6
and the square will be
625
squaring any number whose unit digit is 5
so the method is:
for example we are squaring 25 you all know the square so it's unit digit is 5
hence last two digit of this square is2 and 5 for finding first digit we multiply 2("because it is first digit of 25") by the consecutive number which is 3 so no. will be 6
and the square will be
625
No comments:
Post a Comment