We've been steadily adding new content to the Khan Academy library all year, and this summer we'll be updating the corresponding math missions to reflect this.

This means that your mission progress % will likely go down since the denominator of skills will increase (so say, instead of mastering 90 out of 100 skills, you'll now have mastered 90 out of 110, which would reduce your percentage from 90% to 82%). You'll still have mastered the same * number* of skills as before, you'll just have additional ones to complete now.

We expect the drop to be between 0% and 20% depending on the mission and the student. More typically, students will see a 3% to 5% drop in their progress percentage.

We're always working to improve our math missions, and progress % dropping is an unfortunate side effect when we do add new content to missions. We try to make these changes when most of our users are experiencing summer in order to minimize disruption to the classroom, but we recognize this still isn't ideal for students. If you have some ideas for other ways we might approach this situation, we'd love to hear them!

Read a summary of the changes below, or check out this spreadsheet for full details about the exercises getting added.

**Early math**

We're adding 8 skills, and the maximum possible drop in student completion percentage is 8%.

**Kindergarten**

We're adding 2 skills, and the maximum possible drop in student completion percentage is 7%.

**1st grade**

We're adding 4 skills, and the maximum possible drop in student completion percentage is 14%.

**2nd grade**

We're adding 2 skills, and the maximum possible drop in student completion percentage is 4%.

**3rd grade**

We're adding 10 skills, and the maximum possible drop in student completion percentage is 9%.

**4th grade**

We're adding 15 skills, and the maximum possible drop in student completion percentage is 12%.

**5th grade**

We're adding 6 skills, and the maximum possible drop in student completion percentage is 6%.

**6th grade**

We're adding 14 skills, and the maximum possible drop in student completion percentage is 11%.

**7th grade**

We're adding 5 skills, and the maximum possible drop in student completion percentage is 5%.

**8th grade**

We're adding 14 skills, and the maximum possible drop in student completion percentage is 13%.

**Arithmetic**

We're adding 5 skills, and the maximum possible drop in student completion percentage is 4%.

**Pre-algebra**

We're adding 7 skills, and the maximum possible drop in student completion percentage is 4%.

**Basic geometry**

We're adding 24 skills, and the maximum possible drop in student completion percentage is 24%.

**Algebra basics**

We're adding 6 skills, and the maximum possible drop in student completion percentage is 6%.

**Algebra I**

We're adding 30 skills, and the maximum possible drop in student completion percentage is 15%.

**High school geometry**

We're adding 2 skills, and the maximum possible drop in student completion percentage is 2%.

**Algebra II**

We're adding 1 skills, and the maximum possible drop in student completion percentage is 1%.

**Trigonometry**

We're adding 1 skills, and the maximum possible drop in student completion percentage is 4%.

**Precalculus**

We're adding 0 skills, and the maximum possible drop in student completion percentage is 0%.

**High school statistics**

We're adding 1 skills, and the maximum possible drop in student completion percentage is 2%.

**AP Calculus AB**

We're adding 41 skills, and the maximum possible drop in student completion percentage is 27%.

**AP Calculus BC**

We're adding 45 skills, and the maximum possible drop in student completion percentage is 24%.

**Differential calculus**

We're adding 1 skills, and the maximum possible drop in student completion percentage is 1%.

**Integral calculus**

We're adding 7 skills, and the maximum possible drop in student completion percentage is 10%.

**3rd grade (Eureka Math/EngageNY)**

We're adding 10 skills, and the maximum possible drop in student completion percentage is 9%.

**4th grade (Eureka Math/EngageNY)**

We're adding 12 skills, and the maximum possible drop in student completion percentage is 10%.

**5th grade (Eureka Math/EngageNY)**

We're adding 4 skills, and the maximum possible drop in student completion percentage is 4%.

**6th grade (Eureka Math/EngageNY)**

We're adding 13 skills, and the maximum possible drop in student completion percentage is 10%.

**7th grade (Eureka Math/EngageNY)**

We're adding 5 skills, and the maximum possible drop in student completion percentage is 5%.

**8th grade (Eureka Math/EngageNY)**

We're adding 14 skills, and the maximum possible drop in student completion percentage is 13%.

**Mathematics I**

We're adding 5 skills, and the maximum possible drop in student completion percentage is 3%.

**Mathematics II**

We're adding 12 skills, and the maximum possible drop in student completion percentage is 9%.

**Mathematics III**

We're adding 0 skills, and the maximum possible drop in student completion percentage is 0%.

*Last updated: September 21, 2017 *

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