Tangram is easy to make and gives hours of fun to children from old! Print and cut this and then use the shapes to make all sorts of patterns and pictures. Build visual perceptual skills while having FUN!
Marble Races with a cheap pool noodle (occupies the kids for hours.) Did this, but instead of cutting the pool noodle, the marble is small enough to fit inside the full noodle to roll down. Then can use the noodle for other things too!