nouns ("approximately 100", f.) and ("pair", f.) can be declined and can form compound numerals: (≈300), (5 pair of socks). approximate numbers are colloquially formed by reversing word order, exchanging numeral and noun: (≈3 minutes). ranges (hyphenated) are also possible: (5–6 days), (probably 5–6 days). the word (minus) declines if standalone, but does not for negative numbers: – minus three degrees (wrong: *); however: – three minuses.