Round each number to the nearest thousand, then add.<br><br>&bull; 3280: hundreds digit is 2 (2 &lt; 5), round down &rarr; 3000<br>&bull; 1754: hundreds digit is 7 (7 &ge; 5), round up &rarr; 2000<br>&bull; Estimate: 3000 + 2000 = 5000<br><br>Final Answer: 3000 + 2000 = 5000