Benchmark 4G
The Physical Setting: Forces of Nature
Grades 3-5, page 94

Without touching them, a magnet pulls on all things made of iron and either pushes or pulls on other magnets.

NSES Content Standard B 
Physical Science: Light, heat, electricity, and magnetism 
Grades K-4, page 127 
Magnets attract and repel each other and certain kinds of other materials.