What do Visual Memory Skills have to do with Maths?
Research has found that children with learning difficulties specific to mathematics (dyscalculia) show poor visuo-spatial memory performance. Dyscalculia affects between 3 to 6% of the population. Full research article: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3878850/
Here is a fabulous activity that looks at integrating visual memory skills with spatial skills.
FREE Spatial Grids available here: https://goo.gl/vFgVVJ