To estimate the number of hats, \( h \), that each shelter will receive from the total of 1,596 hats donated to 4 shelters, the best equation to use would be:
\[ 1,600 \div 4 = h \]
This equation uses a rounded number (1,600) to make the division easier while still providing a good estimate of how many hats each shelter will receive when you divide by 4.
So, the response is:
1,600 ÷ 4 = h