My DD & I are going through the same thing. Many of her numbers look like other numbers because they are so sloppy.
Her 4's look 8?
Our game plan is
Number 1 any work that comes from school unreadable is redone
Number 2 She has to write her numbers Kindergarten style 5 times everyday after school until we start seeing improvement.
I think our biggest problem is that her school has pencil racer tasks every week which requires them to do math facts fast.
Having to write math fast every week has encouraged her sloppy habits.
