MathRacks /Rekenrek Website - Amazing tools to build number sense! Love the magnetic whiteboard ones for whole group lessons.
Parent Resources
Helping Your Child Learn Mathematics - Preschool through Grade 5 - English (US Dept. of Education)
Helping Your Child Learn Mathematics - Preschool through Grade 5 - Spanish (US Dept. of Education)
Helping Your Child Learn Mathematics - Preschool through Grade 5 - Spanish (US Dept. of Education)