17. During the Middle Ages, the people of Europe used the Roman numerals one through ten for
basic math such as adding and subtracting. However, the Roman system did not have a number
for zero. That made adding and subtracting very hard. Three centuries earlier, Arabic people had
invented another kind of numbering system, the one we use today, which had a zero. This
system was brought to Europe in the 12th century and quickly became popular. Today, Arabic
numbers are used universally in mathematics. _______________
(A)Consequently, both the Chinese numeral characters and the Roman numerals were replaced
by Arabic numerals in mathematical writings.
(B) In contrast, Roman numerals are used only on clock faces—and in outlines!
(C) In this way Roman numerals were totally abandoned in favor of Arabic numerals.
(D) In some cases, they are the most common symbolic representation of numbers in the world.
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