Abacus

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Explanation through photos

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An abacus is a tool of calculation. A lot of children learn abacus. Once you become good with an abacus, you can calculate very quickly.
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First, let's try to put a number on the abacus. This is "0" (zero).
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This black mark indicates the "first digit." The first digit is from 1 to 9.
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This is "1."
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This is "2."
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"5" is indicated by an upper counter.
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This is "6."
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This is "7."
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To indicate "10," make the "first digit" into "0," and "tens digit" into "1."
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This is "20."
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This is "100."
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Now let's try some calculations. Let's do "addition." "1+1+1+1+5 = ." When you move a lower counter to add, use the thumb.
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When you add the 5 counter, move it with the index finger. The answer is "9."
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Then let's do "subtraction." "9-5-4 = ." Use the index finger to subtract.
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The answer is "0."
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When you use an abacus, sitting up straight is the most important. Pull your chair close to the desk.