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The abacus
A counting frame that's been around for thousands of years. Each column is a place value — beads represent the digit.
Abacus
Click a row of beads. Each column is 10× the one to its right.
0
thousands
0
hundreds
0
tens
0
ones
0
How to read an abacus
The rightmost column is the ones. Move beads to set how many ones (0–9). The next column to the left is the tens, then hundreds, then thousands. To read the number, just collect the digits.