This resource focuses on the concept of adding equal groups through repeated addition. It outlines a lesson in which students learn to represent sets of equal groups using addition sentences to find a total sum. The lesson begins with a recall exercise where students think about previously organized groups and then progresses to a practical example involving baskets of apples. Students are encouraged to engage in a discussion with a partner about the reasoning behind their addition sentence. The lesson also includes a comparison of two sets of addition sentences to identify which one represents equal groups, followed by a problem-solving activity where students calculate totals. Finally, students reflect on what constitutes a 'repeated' addition sentence, emphasizing the concept of equality in their explanations.