Worksheets · Algebra 1

Percent of change worksheet for Algebra 1

Two kinds of question. The first gives two values and asks for the percent of change between them, which is the difference over the original, and the answer says whether it went up or down. The second gives a number and a percent and asks for the result. Easy lands on whole numbers; hard uses eighths like 12.5%, which are the ones that catch people out.

Also taught in Pre-Algebra, at its own level and with its own examples.

Select your difficulty

Pick more than one for a sheet that mixes them.

The preview can look cramped on a phone. The PDF and printed sheet come out normal.

Free math worksheets at sigmaprep.io/worksheets© 2026 Sigma Prep

Sigma Prep · sigmaprep.io/worksheets

Name

Percent of Change

Date Period

Find each percent of change, or each result.

  1. Find the percent of change

    Attendance at a game goes from 180 to 45. Find the percent of change.
  2. A town's population goes from 120 to 300. Find the percent of change.
  3. Find the percent of change from 300 to 120
  4. A price changes from $225 to $315. Find the percent of change.
  5. Find the percent of change from 250 to 400
  6. Attendance at a game goes from 275 to 55. Find the percent of change.
  7. A price changes from $275 to $165. Find the percent of change.
  8. A town's population goes from 250 to 450. Find the percent of change.
  9. A price changes from $450 to $315. Find the percent of change.
  10. Find the percent of change from 450 to 585
  1. Increase or decrease a number by a percent

    What is 120 after a 75% decrease?
  2. What is 350 after a 5% increase?
  3. Decrease 20 by 20%
  4. Increase 320 by 10%
  5. 260 decreased by 40%
  6. Increase 390 by 25%
  7. 120 increased by 15%
  8. 320 decreased by 50%
  9. 110 increased by 10%
  10. Decrease 140 by 25%

Free math worksheets at sigmaprep.io/worksheets© 2026 Sigma Prep

Sigma Prep · sigmaprep.io/worksheets

Name

Percent of ChangeAnswer keyVersion 1

Date Period

Find each percent of change, or each result.

  1. Find the percent of change

    Attendance at a game goes from 180 to 45. Find the percent of change.75% decrease
  2. A town's population goes from 120 to 300. Find the percent of change.150% increase
  3. Find the percent of change from 300 to 12060% decrease
  4. A price changes from $225 to $315. Find the percent of change.40% increase
  5. Find the percent of change from 250 to 40060% increase
  6. Attendance at a game goes from 275 to 55. Find the percent of change.80% decrease
  7. A price changes from $275 to $165. Find the percent of change.40% decrease
  8. A town's population goes from 250 to 450. Find the percent of change.80% increase
  9. A price changes from $450 to $315. Find the percent of change.30% decrease
  10. Find the percent of change from 450 to 58530% increase
  1. Increase or decrease a number by a percent

    What is 120 after a 75% decrease?30
  2. What is 350 after a 5% increase?367.5
  3. Decrease 20 by 20%16
  4. Increase 320 by 10%352
  5. 260 decreased by 40%156
  6. Increase 390 by 25%487.5
  7. 120 increased by 15%138
  8. 320 decreased by 50%160
  9. 110 increased by 10%121
  10. Decrease 140 by 25%105

Free math worksheets at sigmaprep.io/worksheets© 2026 Sigma Prep

How to do these

80 increased by 25%

  1. 25% of 80 is 20.
  2. Increased means add it on.

The answer is 100.

Where students go wrong

Taking the percent of the wrong number, or thinking a 20% rise then a 20% fall returns you to the start. It does not: the fall is 20% of a bigger number, so you end up lower than you began.

Also called percent increase, percent decrease or percentage change.

What you can put on this worksheet

Find the percent of change between two values
Find the percent of change from 100 to 75 → 25% decrease
Increase or decrease a number by a percent
120 decreased by 25% → 90
Rounded to the nearest tenth of a percent
By what percent does 18 increase or decrease when it becomes 75? Round to the nearest tenth of a percent. → 316.7% increase

Questions about these worksheets

Yes. Every percent of change 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 1 is usually taken around 8th or 9th 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 percent of change 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.

You pick from 3: find the percent of change between two values, increase or decrease a number by a percent and rounded to the nearest tenth of a percent. Tick as many as you want and set how many of each, or let it spread them evenly.

Taking the percent of the wrong number, or thinking a 20% rise then a 20% fall returns you to the start. It does not: the fall is 20% of a bigger number, so you end up lower than you began.