In the last three months, 672 boys and 839 girls were seen by doctors in the ER. 545 those children were six-years-old or under. a. By rounding the values to the nearest ten, estimate the number of children seen in the ER. b. Using the original values, calculate the exact number of children seen in the ER. c. By rounding the values to the nearest ten, estimate the number of children over the age of six.

To solve this problem, we will first calculate the total number of children seen in the ER by adding the number of boys and girls. Then, we will round this total to the nearest ten to estimate the number of children seen in the ER. Next, we will calculate the exact number of children seen in the ER by adding the number of boys and girls. Finally, we will round the number of children over the age of six to the nearest ten to estimate this number. Let's start by calculating the total number of children seen in the ER: Total number of children = Number of boys + Number of girls Total number of children = 672 + 839 Total number of children = 1511 Now, let's round this total to the nearest ten to estimate the number of children seen in the ER: Rounded total = 1510 Next, we will calculate the exact number of children seen in the ER: Exact total = 672 + 839 Exact total = 1511 Now, let's round the number of children over the age of six to the nearest ten to estimate this number: Number of children over 6 years old = Total number of children - Number of children 6 years old or under Number of children over 6 years old = 1511 - 545 Number of children over 6 years old = 966 Therefore, the estimated number of children seen in the ER is 1510, the exact number of children seen in the ER is 1511, and the estimated number of children over the age of six is 970.