Quantities
Round off seven-digit or greater numbers wherever possible. When one million is reached, numbers should read one million, two million, etc., not 1,000,000. However, if the number requires a decimal point, the numeral should be used in place of the word.
For example: The GTA is home to 6.2 million people (not 6,200,500, 6.21 million, six‑point‑two million).
Exception: When writing about money, use the numeral.
For example: The university received $1 million from BMO Financial Group in 2004 to go toward the university's North Oshawa Library.
Unless precision is essential, keep decimals to two places (12.25 metres, not 12.254 metres)