<https://nl.khanacademy.org/math/cc-fourth-grade-math/cc-4th-mult-div-topic#cc-4th-area-models>
<http://schema.org/name>
<https://nl.khanacademy.org/math/cc-fourth-grade-math/cc-4th-mult-div-topic/cc-4th-area-models/e/multiplying-2-digit-numbers-with-area-models>