Numeral ppt courseware for the total review of senior high school entrance examination

Words that indicate the number are cardinal numbers, such as: one, two, three, etc. The method of composition is as follows: 1) From 1 to 12 are represented by 12 different words from one to twelve. 2) Both ends from 13-19 with the suffix -teen. 3) The entire ten-digit numbers from 20-90 end with the suffix -ty. When expressing "a few dozens", a hyphen is needed between the one's place and ten's place, such as twenty-one, thirty-two, forty-three, etc. 4) How to write and read numbers: ⑴Hyphen “-” should be added between tens and ones; ⑵And should be added between hundred and tens; ⑶Numbers with more than three digits, from the single digit forward Number, add a comma "," for every three digits, the first comma from the back to the front represents thousand, the second comma represents million, and the third comma is billion. Note that these words cannot be in the plural It cannot be added afterwards.

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