O. Our school is small. There are 27 in 3 rd grade, 38 in 4 th grade, 27 in 5 th grade and 36 in 6 th grade. How many children are in the school?

To find the total number of children in the school, simply add up the number of students in each grade. So that would be: 27 (3rd grade) + 38 (4th grade) + 27 (5th grade) + 36 (6th grade). When you calculate this, you get 27 + 38 + 27 + 36 = 128 children in total. Let’s keep a note of how we can double-check our calculations. One great tip is to group numbers that are easy to add together. For instance, you could pair 27 (3rd) and 36 (6th) to get 63, and then pair 38 (4th) and 27 (5th) to get 65. Then simply add 63 and 65, resulting in 128. This method can help prevent mistakes and make math feel a bit more manageable!