Unifix Cubes®

Didax, Inc.

Unifix Cubes are large, colorful plastic cubes that snap together. They are useful manipulatives for preschool through second or third grade. Hands-on demonstrations using these snap-together blocks can be extremely helpful in teaching concepts to your children, even if you are using a curriculum. The visual presentation and hands-on practice will help children to better understand what they are doing.

Didax sells various sets of Unifix Cubes . A set with 100 cubes should be sufficient for most situations.
Unifix books that might be helpful are:Developing Number Concepts: Addition and Subtraction
Developing Number Concepts: Place Value, Multiplication, and Division
Developing Number Concepts: Counting, Comparing, and Pattern
Mathematics activities for home schooling with Unifix cubes: Preschool to grade 4
(The first three books are published by Dale Seymour and the last by Didax.)