# A pre-Super Bowl refresher on Roman numerals

With Super Bowl XLVI approaching, a primer on Roman numerals:

I equals 1

V equals 5

X equals 10

L equals 50

C equals 100

D equals 500

M equals 1,000

Roman numerals are usually arranged in descending value and added up from left to right. But when a smaller number is placed before a larger one, the smaller value is subtracted from the larger one to the right.

For example: IV is 4, XL is 40 and CM equals 900. So MCMXLIV is 1944.

There are certain restrictions when subtracting. For example, 45 is written as XLV, not VL. And 49 is XLIX, not IL.

Source: Gerard Michon of -http://www.numericana.com
{"ft_lang_label":"__label__en","ft_lang_prob":0.87450755,"math_prob":0.99715835,"size":536,"snap":"2021-31-2021-39","text_gpt3_token_len":154,"char_repetition_ratio":0.13157895,"word_repetition_ratio":0.0,"special_character_ratio":0.2817164,"punctuation_ratio":0.14634146,"nsfw_num_words":0,"has_unicode_error":false,"math_prob_llama3":0.98353976,"pos_list":[0],"im_url_duplicate_count":[null],"WARC_HEADER":"{\"WARC-Type\":\"response\",\"WARC-Date\":\"2021-07-27T13:15:01Z\",\"WARC-Record-ID\":\"<urn:uuid:a3cf0205-e13a-4e9b-b8e4-fcd11b659e3c>\",\"Content-Length\":\"250471\",\"Content-Type\":\"application/http; msgtype=response\",\"WARC-Warcinfo-ID\":\"<urn:uuid:6d855c7f-5dcd-4b73-a7c2-324aeb0add28>\",\"WARC-Concurrent-To\":\"<urn:uuid:12a1cdd0-a30f-4238-9884-4096e79eed6a>\",\"WARC-IP-Address\":\"151.101.249.153\",\"WARC-Target-URI\":\"https://www.nfl.com/news/a-pre-super-bowl-refresher-on-roman-numerals-09000d5d82674d46\",\"WARC-Payload-Digest\":\"sha1:WLLVEMKAJJR6XBIBRKNHULS6W4BEC7VC\",\"WARC-Block-Digest\":\"sha1:JII3TYGUTJ46KRA34DOOKB2BX3KQLWIG\",\"WARC-Identified-Payload-Type\":\"text/html\",\"warc_filename\":\"/cc_download/warc_2021/CC-MAIN-2021-31/CC-MAIN-2021-31_segments_1627046153391.5_warc_CC-MAIN-20210727103626-20210727133626-00718.warc.gz\"}"}