# Efficacy

## A guide to 3rd grade math topics
  
Jul 14  
[Stephanie Yandow](https://blog.duolingo.com/author/stephanie-yandow/)

## A guide to 4th grade math topics
  
Jul 14  
[Stephanie Yandow](https://blog.duolingo.com/author/stephanie-yandow/)

## A guide to 2nd grade math topics
  
Jul 14  
[Alex Emond](https://blog.duolingo.com/author/alex-emond/)

## A guide to 7th grade math topics
  
Jul 14  
[Stephanie Yandow](https://blog.duolingo.com/author/stephanie-yandow/)

## A guide to 5th grade math topics
  
Jul 14  
[Alex Emond](https://blog.duolingo.com/author/alex-emond/)

## A guide to 8th grade math topics
  
Jul 14  
[Alex Emond](https://blog.duolingo.com/author/alex-emond/)

## A guide to 6th grade math topics
  
Jul 14  
[Alex Emond](https://blog.duolingo.com/author/alex-emond/)

## How Duolingo teaches writing skills
  
Jul 2  
[Cindy Blanco, Ph.D.](https://blog.duolingo.com/author/cindy/)

## How Duolingo teaches listening skills
  
May 5  
[Cindy Blanco, Ph.D.](https://blog.duolingo.com/author/cindy/)