基数（cardinal number） [数式・記号の読み方]
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百 100 one hundred
千 1,000 one thousand
万 10,000 ten thousand
10万 100,000 one hundred thousand
12万3千 123,000 one hundred twenty three thousand
100万 1,000,000 one million
1000万 10,000,000 ten million
1億 100,000,000 one hundred million
10億 1,000,000,000 one billion
100億 10,000,000,000 ten billion
1000億 100,000,000,000 one hundred billion
1兆 1,000,000,000,000 one trillion
10兆 10,000,000,000,000 ten trillion
100兆 100,000,000,000,000 one hundred trillion
