An abacus is an ancient tool or device that is stilled used today in some countries such as in Japan and China.
The abacus can be used to do some basic math such as adding, subtracting and even multiplication. It is commonly used in the United States to help students understand place value.
First, here are a few things to keep in mind!
Lower deck with 5 beads
Starting from the right side and moving to the left, each of the red beads in the first set is equal to 1.
Each of the red beads in the second set is equal to 10
Each of the red beads in the third set is equal to 100
Each of the red beads in the fourth set is equal to 1000
.
.
.
All the way to the last set on the left where each of the red beads is equal to 100,000,000
Upper deck with 2 beads
Starting from the right side and moving to the left, each of the green beads in the first set is equal to 5.
Each of the green beads in the second set is equal to 50
Each of the green beads in the third set is equal to 500
Each of the green beads in the fourth set is equal to 5000
.
.
.
All the way to the last set on the left where each of the green beads is equal to 500,000,000
Below, see how to use the abacus to show 26,408
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