Here are online resources for math teachers

Khan Academy. Teachers can assign quizzes and units to students and receive feedback reports on students progress through assigned work. Supplementary or additional practice can be assigned based on feedback reports. Teachers can adjust classroom activities and lesson planning based on students' progress. Subjects include math, science and economics.

Graph paper maker for Windows. Downloadable software to produce graph paper

National Library of virtual manipulatives. A digital library containing virtual  activities for K-12 mathematics. The activities in the library present math  in a visual fun and engaging way for students. Java applets are used. Java must be installed on your local machine.

NRICH  University of Cambridge enriching mathematics website for parents, teachers and students.  The website hosts resources, activities and lesson plans for Early Years (pre-K), primary and secondary math instruction.

http://nrich.maths.org/teacher-primary