Endangered Eagles
publish date: 2025/06/11 04:27:00 UTC
In 1963,there were only 487 nesting pairs of bald eagles in the lower 48 states. By 2007,the number of nesting pairs had increased by 9,302.Find the number of nesting pairs of bald eagles in 2007.(Source: U.S. Fish and Wildlife Service)
Answer = (1)
Correct Answer
Explanation
We will carefully read the problem looking for key words or phrases. Key words and phrases indicate which arithmetic operations should be used
to solve the problem.
Solution
The phrase increased by indicates addition. With that in mind, we translate the words of the problem to numbers and symbols.
The number of nesting pairs in 2007 is equal to the number of nesting pairs in 1963 increased by 9,302
The number of nesting pairs in 2007 = 487 + 9,302
Use vertical form to perform the addition:
\[ \begin{array}{r} \phantom{0}9,\!302 \\ +\phantom{0}487 \\ \hline 9,789 \\ \end{array} \]
In 2007, the number of nesting pairs of bald eagles in the lower48 states was 9,789
Reference
Mathematics for college students