US Department of Education
Helping Your Child Learn Math: Math on the Go
Parents and children explore math in the world around them in this collection of math activities. Simple, engaging, and fun, these lessons offer learners the opportunity to discover math even when they're "on the go." An excellent...
Other
The Virtual Vine: Apple Pickin' Time
This is a fun cross-curricular unit on Johnny Appleseed! Provides lots of ideas for integrating apples into the classroom -- from math exercises to recipes. Lots of links to other resources too.
Varsity Tutors
Varsity Tutors: Hotmath: Practice Problems: Solving Linear Systems by Substitution
Twenty-seven problems present a variety of practice solving linear systems by substitution. They are given with each step to the solution cleverly revealed one at a time. You can work each step of the problem then click the "View...