Arithmetic (AA/AI SL 1.2)
Keywords
Arithmetic Sequences  等差数列（とうさすうれつ）  等差数列（děng chā shù liè）  등차 수열 (deungcha suyeol) 
Arithmetic Series  等差シリーズ（とうさシリーズ）  等差级数（děng chā jí shù）  등차 시리즈 (deungcha sirijeu) 
nth term formula  n番目の項の公式（nばんめのこうのこうしき）  第n项公式（dì n xiàng gōng shì）  n번째 항의 공식 (nbeonjjae hangui gongsik) 
Sum of the first n terms  初項からn項までの和（しょこうからnこうまでのわ）  前n项和（qián n xiàng hé）  첫 n 항의 합 (cheot n hangui hap) 
Common difference  公差（こうさ）  公差（gōng chā）  공차 (gongcha) 
Inqury questions
Factual Inquiry Questions
 Conceptual Inquiry Questions
 Debatable Inquiry Questions

The Arithmetic Adventure
Exploration Title: "The Arithmetic Adventure"
Objective:
Embark on an arithmetic adventure to discover the hidden treasures of sequences and series. Use the powers of addition and difference to navigate through the world of arithmetic progression.
Mission Steps:
1. Term Treasure Hunt:
 Calculate the 100th term of the sequence that begins with 5 and has a common difference of 7.
 Compare the 100th term with the 1st term and discuss how quickly the terms grow.
2. Sum Saga:
 Find the sum of the first 50 terms of the sequence you investigated in step 1.
 How does this sum relate to the individual terms of the sequence?
3. Common Difference Challenge:
 Change the common difference to 3. What happens to the sequence?
 How does a negative common difference affect the sum of the series?
Questions for Investigation:
1. Patterns of Progression:
 Why does an arithmetic series with a positive common difference grow without bound?
2. Sum vs. Term:
 How does the sum of the terms compare to the value of the last term in a long arithmetic sequence?
3. Practical Applications:
 Where do you encounter arithmetic sequences in real life? (Think savings plans, paying off debt, etc.)
Engagement Activities:
 "Sequence Prediction": Without calculation, predict whether the 200th term will be an even or odd number for a given first term and common difference.
 "Sum Duel": Compete with a partner to see who can calculate the sum of the first 'n' terms of a sequence faster.
Dive into this arithmetic expedition, uncover the linear patterns of sequences, and unveil the accumulating power of series. Happy calculating!
Part 2  Checking understanding
Watch the two videos below before attempting the questions
Alternatively these videos are very short, and work through examstyle questions directly.
Arithmetic sequences 1 https://youtu.be/jJCRJ1XOq9s Arithmetic sequences 2 https://youtu.be/Q9jTuF6KX6k Arithmetic sequences 3 https://youtu.be/hZN9VGVSygQ
What is the common difference of the arithmetic sequence 4, 7, 10, 13, ...?
Given the first term of an arithmetic sequence is 5 and the common difference is 3, what is the 10th term?
The 3rd term of an arithmetic sequence is 9 and the 8th term is 24. What is the first term?
If the sum of the first n terms of an arithmetic sequence is given by what is the common difference?
Practical applications centred around life in China
Part 3  Testing your understanding with examstyle questions
Testing your understanding with examstyle questions