Math is not a subject that is naturally intuitive – it requires teaching, strategies and conceptual understanding. If your child has trouble with the foundations of a topic, they will not understand the additional concepts that are built off of the knowledge of that core concept which can continue to compound the issue. When a child is having a tough time understanding math, they will typically get frustrated and either disengage or act out – neither of which will help them to be successful in math class.
Source: https://www.mathnasium.ca/countryhills/news/how-do-you-know-if-your-child-needs-help-with-math