Someone periodically will think about the graph paper and try to get him to use it but he completely disregards the squares. It is useless. Doesn't the mod math just go up through long division? I think the sp.ed teacher tried it last year and it was too fussy. He is not particularly slow when he writes, but no one can read it. He doesn't care that no one can read it, so these apps like mod math seem unreasonably tedious to him when he could do the handwriting faster.