Negative Numbers
Making a number negative in Thai is simple - just add ลบ [ลบ] ("minus") in front of any number. The same word also works as the minus sign in a calculation, so context tells you whether it means "negative" or "subtract".
Basic Math Operations
The table below covers the five operators you'll use most often. Each one is an ordinary Thai word - not an abbreviation or a special symbol.
Number Formatting
Thailand uses a comma (,) to separate thousands and a period (.) for the decimal point, eg 1,000.50. When a number is written in Thai numerals (๑, ๒, ๓...) though, the thousands comma is usually left out.
Decimals
The decimal point is read as จุด [จุด] ("point"), and each digit after it is read on its own rather than as one combined number - so 3.14 is read "three point one four", never "three point fourteen".
Fractions
The word for "half", ครึ่ง [คฺรึ่ง], is its own irregular word rather than built from a general rule. Every other fraction follows the pattern [numerator] + ใน [ไน] ("in/of") + [denominator] - so 1/4 is "หนึ่งในสี่" ("one in four").
Percentages
Saying a percentage in Thai is straightforward - just say the number followed by เปอร์เซ็นต์ [เปอ-เซ็น], a direct loanword from English "percent".
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