The population of a town was 78787 in 1991 and 95833 in 2001. Estimate the increase in population by rounding off each population to nearest hundreds.
17,100
Step 1: Round 1991 population (78,787) to the nearest hundred
Look at the tens digit.
\(78{,}787\)
Tens digit \(= 8\) which is \(\ge 5\).
So, round up the hundreds place and make tens and ones zero.
\(78{,}787 \approx 78{,}800\)
Step 2: Round 2001 population (95,833) to the nearest hundred
Look at the tens digit.
\(95{,}833\)
Tens digit \(= 3\) which is \(< 5\).
So, keep the hundreds place the same and make tens and ones zero.
\(95{,}833 \approx 95{,}800\)
Step 3: Find the estimated increase
\(\text{Increase} = 95{,}800 - 78{,}800\)
\(= 17{,}000\)