Teach counting, addition, and subtraction with this virtual material.

Rekenrek/Abacus

Tool
Grade 1, 2, 3
General
The Rekenrek, Abacus, or Counting Frame is a tool for aiding and visualizing a wide range of number-related problems such as counting, addition, and subtraction. It helps students to understand number structures. You can use it with the traditional red and white beads for a five-based structure, with a 10-based structure or even with various other colors. Move the beads from left to right or vice versa to demonstrate basic operations.

Standards
K.CC.B.4
K.OA.A.2
K.NBT.A.1