_:ndccfe3caec19421fa77ba7ec41f95f57xb3
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<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>