National Library of Virtual Manipulatives
This site allows your child to work with manipulatives in computing various math problems. The students are challenged to create, play and enjoy all while learning.
Ohio Department of Education
This site allows you to take practice achievement tests in math, reading and writing. You can either take the test on-line or print out a copy of the assessments. When taking the test on-line, your test is scored automatically so you know if you are answering correctly or not. It also discusses various test questions and the ways in which the essay test questions are scored.