If your child had always struggled with math concepts, there may be something more going on than just memory issues or inattention in math. This is a great article on Dyscalculia. Dyscalculia falls under the umbrella of Dyslexia, but affects math instead of reading. Read and learn more. Education is power!
https://www.dyslexicadvantage.org/tips-for-supporting-a-student-with-dyscalculia-steve-chinn/
