Numbers can be written in lowercase, uppercase, title case, sentence case, etc. Place values must be known before writing numbers in words. Numbers above 999 should not use commas. Numbers of four or more digits should use commas
Number names 1 to 50 represent numbers in their word form. Numbers 1 to 20 have different spellings, 20 onwards follows pattern. Numbers can be written by expanding them and combining addend names
Centuries are periods of 100 years. Each new century begins with year 01. Centuries can be written in numerals or words
Japanese uses both Arabic and Chinese numerals for writing numbers. Numbers have two pronunciations: Sino-Japanese (on'yomi) and Japanese (kun'yomi). Large numbers follow Chinese style grouping by 10,000
Numbers, numerals, and digits are different but related mathematical terms. Numbers represent quantities, numerals are written representations. Numbers from 1 to 9 are spelled out, except for spaces
Number names are English words used to represent numbers. Learning number names helps spell out numbers in formal writing. Numbers can be written in words from 1 to 100