# Arithmetic Series Formula Practice Problems

Solve each problem on paper then click the ANSWER button to check if you got it right.

**Problem 1:** Find the sum of the first 300 natural or counting numbers.

## Answer

\color{red}45,150

**Problem 2:** What is the sum of the first 100 positive **odd** numbers?

## Answer

\color{red}10,000

**Problem 3:** What is the sum of the first 100 positive **even** numbers?

## Answer

\color{red}10,100

**Problem 4:** Find the sum of the first **64 terms** of the arithmetic series below.

3 + 9 + 15 + 21 + …

## Answer

\color{red}12,288

**Problem 5:** Find the sum of the first **50 terms** of the arithmetic series below.

- 5 + \left( { - 8} \right) + \left( { - 11} \right) + \left( { - 14} \right) + …

## Answer

\color{red} - 3,925

**Problem 6:** Find the partial sum of the arithmetic series below.

7 + 12 + 17 + 22 + … + 187

## Answer

\color{red}3,589

**Problem 7:** Find the partial sum of the arithmetic series below.

- 8 - 11 - 14 - 17 - … - 113

## Answer

\color{red}-2,178

**Problem 8:** The 15th term of the arithmetic sequence is 33 and the 50th term is 103. What is the 79th partial sum of the arithmetic sequence?

## Answer

\color{red}6,557

**Problem 9:** The 7th term of the arithmetic sequence is -19 and the 13th term is 35. What is the 30th partial sum of the arithmetic sequence?

## Answer

\color{red}1,725

**Problem 10:** The 9th term of an arithmetic sequence is 57 while its 18th partial sum is 1,080. Find the sum of the first 31 terms of the sequence.

## Answer

\color{red}3,069

**You might be interested in:**