sentence: Every column represents a different digit.
sentences_before: Abacuses can do addition, subtraction, multiplication, division, and people can use them to find the square root of whole numbers. Expert, or very good, abacus users can sometimes do math quicker than basic calculators. There is a common Chinese abacus. There are one or two beads in the top rows, and four or five beads in the bottom ones.
concept_name: column
headings: Abacus
categories: Mathematics Mathematical tools