Lesson: Arithmetic Series Mathematics • Second Year of Secondary School

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In this lesson, we will learn how to calculate the sum of the terms in an arithmetic sequence with a definite number of terms.

Students will be able to

recognize the formula for the sum of an arithmetic sequence in terms of the first and last terms,
recognize the formula for the sum of an arithmetic sequence in terms of its first term and common difference,
find the sum of arithmetic sequences with a given number of terms, including a given range of terms, and examples where you know the first and last terms, and the first term and the common difference (or have the information to calculate these),
solve applied problems, including finding the number of terms given the sum and other necessary information.