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 estimate the total number of children seen in the ER, you can round the numbers to the nearest ten: 672 becomes 670 and 839 becomes 840. Adding these rounded values gives you 670 + 840 = 1510. So, around 1510 children were seen in the ER. To find the exact number of children seen in the ER, simply add the number of boys and girls: 672 boys + 839 girls = 1511 children. So, the exact total is 1511 children. For estimating the number of children over the age of six, you can take the total number of children seen in the ER, which is 1511, and subtract the estimated number of those six years old or under. Rounding 545 to the nearest ten gives us 550. Thus, we estimate children over six as 1510 - 550 = 960. So, approximately 960 children are estimated to be over the age of six.