When most of us went to school, if we drew on our mathematics or language or social studies work, we were punished for doodling.
But in Montessori, we encourage children to make their work in any subject a personalized work of art. When they have done real work that they care about, they want to take their paper representation of that work and embellish it.
Embellish as a Montessori term: encouraged doodling ;)
So your stamp game paper for primary?
There are 7 rows. Enough space for 2 problems (if doing using just 2 terms within a problem), and a row in between. The division paper is longer and turned horizontally, so there are 3 rows - enough for two problems written straight across with a doodle-row in between.
That extra row: is designed for embellishment ;)
Short and large bead frame paper? Embellish around the edges and in between problems to keep them separate.
The graph paper used in elementary for so many subjects? Yep! Embellish with borders and separators.
Think of all the art and geometry a child is getting just embellishing all those squares, let alone the unlined paper he also uses. Repeating shapes; something new in each square; alternating designs; varying the colors.
Children in Montessori classrooms leave behind veritable works of art when they leave a classroom, because they do SO much of it.
Art is an external expression of the inner soul. Let's encourage it, entice it, and build on those skills NOW at primary and elementary, so that the child has plenty of strong outlets in the hormonal and emotional adolescent years, when they CRAVE artistic expression of their very souls.