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mult 

        # BigDecimal.mult

(from ruby core)
---
    mult(other, ndigits) -> bigdecimal

---

Returns the BigDecimal product of `self` and `value` with a precision of
`ndigits` decimal digits.

When `ndigits` is less than the number of significant digits in the sum,
the sum is rounded to that number of digits, according to the current
rounding mode; see BigDecimal.mode.

Examples:

    # Set the rounding mode.
    BigDecimal.mode(BigDecimal::ROUND_MODE, :half_up)
    b = BigDecimal('555555.555')
    b.mult(3, 0)              # => 0.1666666665e7
    b.mult(3, 3)              # => 0.167e7
    b.mult(3, 6)              # => 0.166667e7
    b.mult(3, 15)             # => 0.1666666665e7
    b.mult(3.0, 0)            # => 0.1666666665e7
    b.mult(Rational(3, 1), 0) # => 0.1666666665e7
    b.mult(Complex(3, 0), 0)  # => (0.1666666665e7+0.0i)

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