Arithmetic series worksheet

Pair the first term with the last, the second with the second-to-last, and every pair adds to the same thing. That is where the formula comes from: the average of the ends, times how many terms there are.



Sigma Prep · sigmaprep.io/worksheets Name Arithmetic Series Date Period Find each sum. Find the sum of the first 13 terms: $9, 18, 27, \dots$ Find the sum of the first 10 terms: $11, 18, 25, \dots$ Find the sum of the first 21 terms: $- 10, - 16, - 22, \dots$ Find the sum of the first 13 terms: $- 9, - 17, - 25, \dots$ Find the sum of the first 16 terms: $12, 18, 24, \dots$ Find the sum of the first 15 terms: $10, 16, 22, \dots$ Find the sum of the first 8 terms: $- 14, - 8, - 2, \dots$ Find the sum of the first 13 terms: $10, 18, 26, \dots$ Find the sum of the first 24 terms: $15, 24, 33, \dots$ Find the sum of the first 24 terms: $- 15, - 24, - 33, \dots$ Find the sum of the first 10 terms: $- 13, - 7, - 1, \dots$ Find the sum of the first 17 terms: $- 11, - 19, - 27, \dots$ Find the sum of the first 24 terms: $14, 8, 2, \dots$ Find the sum of the first 10 terms: $- 13, - 6, 1, \dots$ Find the sum of the first 17 terms: $- 13, - 7, - 1, \dots$ Find the sum of the first 8 terms: $10, 19, 28, \dots$ Find the sum of the first 9 terms: $- 15, - 23, - 31, \dots$ Find the sum of the first 10 terms: $14, 20, 26, \dots$ Find the sum of the first 23 terms: $11, 18, 25, \dots$ Find the sum of the first 12 terms: $10, 3, - 4, \dots$ Free math worksheets at sigmaprep.io/worksheets© 2026 Sigma Prep

Sigma Prep · sigmaprep.io/worksheets

Name

Arithmetic Series

Date Period

Find each sum.

Find the sum of the first 13 terms: $9, 18, 27, \dots$
Find the sum of the first 10 terms: $11, 18, 25, \dots$
Find the sum of the first 21 terms: $- 10, - 16, - 22, \dots$
Find the sum of the first 13 terms: $- 9, - 17, - 25, \dots$
Find the sum of the first 16 terms: $12, 18, 24, \dots$
Find the sum of the first 15 terms: $10, 16, 22, \dots$
Find the sum of the first 8 terms: $- 14, - 8, - 2, \dots$
Find the sum of the first 13 terms: $10, 18, 26, \dots$
Find the sum of the first 24 terms: $15, 24, 33, \dots$
Find the sum of the first 24 terms: $- 15, - 24, - 33, \dots$
Find the sum of the first 10 terms: $- 13, - 7, - 1, \dots$
Find the sum of the first 17 terms: $- 11, - 19, - 27, \dots$
Find the sum of the first 24 terms: $14, 8, 2, \dots$
Find the sum of the first 10 terms: $- 13, - 6, 1, \dots$
Find the sum of the first 17 terms: $- 13, - 7, - 1, \dots$
Find the sum of the first 8 terms: $10, 19, 28, \dots$
Find the sum of the first 9 terms: $- 15, - 23, - 31, \dots$
Find the sum of the first 10 terms: $14, 20, 26, \dots$
Find the sum of the first 23 terms: $11, 18, 25, \dots$
Find the sum of the first 12 terms: $10, 3, - 4, \dots$



Sigma Prep · sigmaprep.io/worksheets Name Arithmetic SeriesAnswer keyVersion 1 Date Period Find each sum. Find the sum of the first 13 terms: $9, 18, 27, \dots$ $819$ Find the sum of the first 10 terms: $11, 18, 25, \dots$ $425$ Find the sum of the first 21 terms: $- 10, - 16, - 22, \dots$ $- 1470$ Find the sum of the first 13 terms: $- 9, - 17, - 25, \dots$ $- 741$ Find the sum of the first 16 terms: $12, 18, 24, \dots$ $912$ Find the sum of the first 15 terms: $10, 16, 22, \dots$ $780$ Find the sum of the first 8 terms: $- 14, - 8, - 2, \dots$ $56$ Find the sum of the first 13 terms: $10, 18, 26, \dots$ $754$ Find the sum of the first 24 terms: $15, 24, 33, \dots$ $2844$ Find the sum of the first 24 terms: $- 15, - 24, - 33, \dots$ $- 2844$ Find the sum of the first 10 terms: $- 13, - 7, - 1, \dots$ $140$ Find the sum of the first 17 terms: $- 11, - 19, - 27, \dots$ $- 1275$ Find the sum of the first 24 terms: $14, 8, 2, \dots$ $- 1320$ Find the sum of the first 10 terms: $- 13, - 6, 1, \dots$ $185$ Find the sum of the first 17 terms: $- 13, - 7, - 1, \dots$ $595$ Find the sum of the first 8 terms: $10, 19, 28, \dots$ $332$ Find the sum of the first 9 terms: $- 15, - 23, - 31, \dots$ $- 423$ Find the sum of the first 10 terms: $14, 20, 26, \dots$ $410$ Find the sum of the first 23 terms: $11, 18, 25, \dots$ $2024$ Find the sum of the first 12 terms: $10, 3, - 4, \dots$ $- 342$ Free math worksheets at sigmaprep.io/worksheets© 2026 Sigma Prep

Sigma Prep · sigmaprep.io/worksheets

Name

Arithmetic SeriesAnswer keyVersion 1

Date Period

Find each sum.

Find the sum of the first 13 terms: $9, 18, 27, \dots$ $819$
Find the sum of the first 10 terms: $11, 18, 25, \dots$ $425$
Find the sum of the first 21 terms: $- 10, - 16, - 22, \dots$ $- 1470$
Find the sum of the first 13 terms: $- 9, - 17, - 25, \dots$ $- 741$
Find the sum of the first 16 terms: $12, 18, 24, \dots$ $912$
Find the sum of the first 15 terms: $10, 16, 22, \dots$ $780$
Find the sum of the first 8 terms: $- 14, - 8, - 2, \dots$ $56$
Find the sum of the first 13 terms: $10, 18, 26, \dots$ $754$
Find the sum of the first 24 terms: $15, 24, 33, \dots$ $2844$
Find the sum of the first 24 terms: $- 15, - 24, - 33, \dots$ $- 2844$
Find the sum of the first 10 terms: $- 13, - 7, - 1, \dots$ $140$
Find the sum of the first 17 terms: $- 11, - 19, - 27, \dots$ $- 1275$
Find the sum of the first 24 terms: $14, 8, 2, \dots$ $- 1320$
Find the sum of the first 10 terms: $- 13, - 6, 1, \dots$ $185$
Find the sum of the first 17 terms: $- 13, - 7, - 1, \dots$ $595$
Find the sum of the first 8 terms: $10, 19, 28, \dots$ $332$
Find the sum of the first 9 terms: $- 15, - 23, - 31, \dots$ $- 423$
Find the sum of the first 10 terms: $14, 20, 26, \dots$ $410$
Find the sum of the first 23 terms: $11, 18, 25, \dots$ $2024$
Find the sum of the first 12 terms: $10, 3, - 4, \dots$ $- 342$

How to do these

The first 5 terms of $3, 7, 11, \dots$

The fifth term is 19.
The ends average to 11.
Times 5 terms.

The answer is $55$ .

Where students go wrong

Using the last term you were shown instead of the last term you are summing to. The formula needs the nth term, and on a sheet like this it is usually one you have to work out first.

Also called sum of an arithmetic sequence, sigma notation or partial sums.

Questions about these worksheets

Yes. Every arithmetic series sheet is free to print and free to download as a PDF. There is no account to make, no email to hand over and no limit on how many you take.

Yes. The answer key prints on a second page, and you can choose whether it shows each question beside its answer or just the answers in a list.

Yes. Print straight from the page, or download the PDF and print that. The sheet is laid out for paper rather than squeezed off a screen, so there is room to work under each question, and the answer key comes out on its own page.

Algebra 2 is usually taken around 10th or 11th grade, though schools vary and plenty of students meet it earlier or later. Pick the difficulty rather than the grade: the easy level suits a first lesson on it, the hard level suits review before a test.

Yes, as many as you like. The questions are built fresh each time rather than picked from a fixed set of files, so pressing Generate gives a new sheet. That is what you want for a second class, a retake, or two students sitting next to each other.

That is the closest comparison, and Kuta Software is good software. It is also paid software you install on a computer. These worksheets run in a browser tab for free, with no account and nothing to install. Like Kuta, the arithmetic series questions are generated when you ask for them rather than pulled from a fixed set of files, so two classes never get the same sheet, and the answer key comes with it.

Yes. There are three levels, and you can tick more than one for a sheet that mixes them, in which case the questions come out easiest first. The harder levels are not just larger numbers: they ask for something the easy ones do not.

Using the last term you were shown instead of the last term you are summing to. The formula needs the nth term, and on a sheet like this it is usually one you have to work out first.

Arithmetic series worksheet

Arithmetic Series

Arithmetic SeriesAnswer keyVersion 1

How to do these

Where students go wrong

Questions about these worksheets

Are these arithmetic series worksheets free?+

Do the arithmetic series worksheets come with an answer key?+

Are these arithmetic series worksheets printable?+

What grade are these arithmetic series worksheets for?+

Can I get a different version of the same arithmetic series worksheet?+

Is this a free alternative to Kuta Software for arithmetic series?+

Can I choose how hard the arithmetic series questions are?+

What do students get wrong with arithmetic series?+