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I know that in each IEEE 754 number representation the number is in the format of $\text{sign}*\text{Exp}*1.\text{Mantissa}$.

In the case of 64 bit with have: 1 bit for the sign, 11 bits for the exponent and 52 for the mantissa, so where does $1$ (as each number starts 1.) is stored?

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    That bit is kept inside the head of the user of the float ;) – 2017-02-26
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    Note that it is $2^{\rm Exp}$ where the exponent is derived from the exponent bits with a bias subtracted. Or if the exponent bits are interpreted as signed int format, the mantissa interpretation is as $0.1{\rm Mantissa}$. – 2017-02-26

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