To estimate the product of \( 210 \times 733 \), we can round the numbers to make the multiplication easier.
- Round \( 210 \) to \( 200 \) (rounding down).
- Round \( 733 \) to \( 700 \) (also rounding down).
Now, we can multiply the rounded values:
\[ 200 \times 700 = 140,000 \]
So, the estimate for \( 210 \times 733 \) is \( 140,000 \).
Next, let's check if this is an overestimate or an underestimate:
- The actual numbers \( 210 \) and \( 733 \) are both greater than the rounded estimates \( 200 \) and \( 700 \).
- When both factors in a multiplication are increased, the product will also be greater than the estimated product.
Therefore, \( 140,000 \) is an underestimate of the actual product \( 210 \times 733 \).