Unit 1 · Patterns and Sequences
Counting Terms — Pattern Ends at 404
Lesson 5 of 7
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About this lesson
The pattern goes 16, 20, 24, … — adding 4 each time. To count how many terms reach 404, use the nth-term formula: first + (n−1) × step = last. Solve for n.
Chapters
0:00Introduction
0:21The Question
0:54Identifying the Pattern's Rule
1:19Calculating the Total Numerical Growth
1:45Determining the Number of Step Intervals
2:09Exam Strategy — The Fence Post Principle
2:45Confirming the Final Choice
Question
The first three numbers in a number pattern are:
16, 20, 24, …
The last number is 404.
How many numbers are in this number pattern?
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