The topic “Related Subtraction Facts” helps children understand the relationship between addition and subtraction, emphasizing their nature as inverse operations. They will learn to relate and translate between addition and subtraction sentences, fostering an understanding that subtraction can be seen as the process of “undoing” addition. This insight reinforces their grasp of both operations and highlights how they work together in mathematical problem-solving. Additionally, children will explore the concept of decomposing numbers, specifically focusing on breaking down a number into parts that lead to a multiple of ten. This technique simplifies the subtraction process, making it easier to perform calculations. By recognizing how numbers can be decomposed, children will enhance their mental math skills and develop strategies to approach subtraction problems more effectively. Overall, this topic equips children with essential skills and concepts that lay the foundation for more advanced mathematical reasoning in their future studies.