To estimate the product of \( 8.21 \) and \( 3.6 \), we can round the numbers to simplify the calculation:
- Round \( 8.21 \) to \( 8 \)
- Round \( 3.6 \) to \( 4 \)
Now, we can multiply the rounded numbers:
\[ 8 \times 4 = 32 \]
So, the estimate for \( 8.21 \times 3.6 \) is approximately \( 32 \).
Now let's calculate the exact product:
\[ 8.21 \times 3.6 = 29.556 \]
Thus, the estimated product is \( 32 \), and the exact product is \( 29.556 \).