To multiply 35 by 4, you calculate:
\[ 35 \times 4 = 140 \]
Now, to convert 140 to a mixed number, we recognize that 140 is a whole number and does not have a fractional part. Thus, it can be expressed as a mixed number as follows:
\[ 140 = 140 \frac{0}{1} \]
So, the answer as a mixed number is simply:
140 (since it has no fractional part).