In the last three months, 672 boys and 839 girls were seen by doctors in the ER. 545 of 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 estimate the total number of children seen in the ER, we can round the boys and girls to the nearest ten. Rounding 672 boys gives us 670, and rounding 839 girls results in 840. When we add these rounded figures together (670 + 840), we get an estimated total of around 1,510 children. For the exact number of children, we simply add the original values: 672 boys + 839 girls gives us a total of 1,511 children seen in the ER in the last three months. To find the estimated number of children over the age of six, we first calculate the total number seen who were six-years-old or under by rounding to the nearest ten. The rounded figure is 550. Subtracting this estimate from our earlier total estimate of 1,510 gives us an estimated total of about 960 children over the age of six.