Multiples in Mathematics

Lower elementary multiples example - this is typically first year in lower elementary if the child has had a decent amount of primary mathematics. It could happen in later first year if the child is brand new to Montessori altogether. 

each number is circled according to its multiples
see my son's key in the upper corner :)
who says Montessori children don't learn how to use legends?
right here it is - they just don't have an album page for it ;) 

my sample for how to highlight a particular number
again - using a key ;)