This math topic practices finding equations that calculate the sum of series of integers from 1 up to a given number \( N \). It emphasizes deriving the direct formula \( \frac{n(n+1)}{2} \) for the sum of the first \( n \) numbers, based on given summation expressions. The exercises involve choosing the correct formula from multiple choice answers, requiring learners to manipulate and understand the summation notation and its corresponding equation for calculating series sums, as part of broader number pattern analysis skills.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.