Numbers
Numbers 
- Numbers can be either spelled out (e.g. “Nine thousands”) or written in numerals (e.g. “9,000”). Be consistent.
- In case multiple numbers follow each other, write the first in numerals and spell the second one out (e.g. “3 nine-inch boards”).
- Use commas as separators (i.e. “10 thousand” = “10,000”).
- Use full stops for decimals (e.g. “10.5”).
- Only use numbers up to 99,999.
- In the case of millions, billions, etc, said word needs to follow the number and present a space (e.g. “10 million”), but only when it comes to “round numbers” (e.g. “12 million” or “19 billion”).