He mea nui i roto i te ako pāngarau te whakamārama a te tamaiti i āna mahi whiriwhiri otinga. Mā konei e pakari ai tōna reo me tōna hinengaro whakaaro whaitake. Kei konei ētahi tauira whakamārama mō ngā momo rautaki whakaoti paheko. Ka kīia he rautaki wāwāhi tau ēnei.
In mathematics it is important for children to explain how they achieved an answer to a particular problem. This helps to strengthen their language and mathematical reasoning. This section presents examples of explanations for various number operational strategies. The strategies are called part-whole strategies.