Arabic numerals were first invented by ancient Indians, then spread to Europe by Arabs, and then modernized by Europeans. Because of the spread of Arabs, it has become a key node in the international use of such numbers, so people call it "Arabic numerals".
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Whether Arabic numerals (1, 2,3 ...) or Chinese lowercase numerals (1, 2,3 ...) are easy to be altered and tampered with because of their simple strokes. Therefore, the numbers on general documents and commercial financial bills should be capitalized in Chinese characters: one, two, three, four, five, six, seven, eight, nine, ten, one hundred, and one thousand (the strokes of "ten thousand, one hundred, and one trillion" are complicated, and there is little chance of using them, so there is no need to replace them with other words). For example, "3,564 yuan" is written as "3,000 Wu Bai and 64 yuan".
Baidu Encyclopedia-Capital Numbers