Raylene Olinger found CK-12 Foundation:

• Moderately improves attainment“Highly engaging to students”
• Moderately builds student knowledge“Focused lessons”
• Moderately improves teaching efficiency and productivity“All materials in one place, easy to use with Google Classroom”
• Moderately reduces teacher workload“Ease of use with Google Classroom”
• Moderately saves school money“This resource being free has been a blessing”