<https://id.khanacademy.org/math/id-kelas-1/x38ad80c77a2bd598:bilangan-sampai-20>
<http://schema.org/name>
<https://id.khanacademy.org/math/id-kelas-1/x38ad80c77a2bd598:bilangan-sampai-20/x38ad80c77a2bd598:soal-cerita-penjumlahan-dan-pengurangan/e/addition-and-subtraction-word-problems-within-20--level-2>