Multiplying and dividing fractions

Allow you to be remembered as you explore the site from session to session.

Improve site functionality by tracking usage on the website. In some cases these cookies can improve the speed with which we can process your request as they allow us to remember selected site preferences.

Offer the possibility to connect you to your social networks and share content from our website through social media. Advertising cookies (of third parties) collect information to help better tailor advertising to your interests, both within and beyond Pango websites. In some cases, these cookies involve the processing of your personal data.