Math – Arithmetic Sequences (2)

Arithmetic Sequences (2)

Welcome back! In this lesson, we will learn how to find the “n-th” term of an arithmetic sequence — a sequence where the difference between numbers stays the same. You’ll discover a simple formula that lets you find any term without listing all the numbers. Let’s explore how it works and practice together. Let’s have fun learning!

Review

• n-th term = a + d × (n-1) *a: the first term, d: difference between each number

Quiz

Q1. Given 7, 10, 13, 16….. What is the 7th term of this sequence?

Q2. Given 4, 11, 18, 25….. What is the 10th term of this sequence?

Answer

Q1. 7 + 3 × (7 – 1) = 25

Q2. 4 + 7 × 9 = 67