(1) A school has 72 second graders. There are 18 second graders with fall birthdays. Another 17 second graders have winter birthdays. How many second graders have spring or summer birthdays? square second graders

To find the number of second graders with spring or summer birthdays, we need to subtract the number of second graders with fall and winter birthdays from the total number of second graders.<br /><br />1. Total number of second graders: 72<br />2. Number of second graders with fall birthdays: 18<br />3. Number of second graders with winter birthdays: 17<br /><br />First, add the number of second graders with fall and winter birthdays:<br /><br />\[ 18 + 17 = 35 \]<br /><br />Next, subtract this sum from the total number of second graders to find those with spring or summer birthdays:<br /><br />\[ 72 - 35 = 37 \]<br /><br />Therefore, there are 37 second graders with spring or summer birthdays.<br /><br />The answer is \( \boxed{37} \) second graders.