Correct spelling, explanation: the correct form is forty-five (with a hyphen). The hyphen is used to improve clarity and readability. Without it, there’s a risk of the number being misread or appearing ambiguous. Fourty five could be mistaken for two separate numbers, 40 and 5. The correct spelling is forty (not fourty), The reason for this lies in etymology: in Old English, forty derived from feowertig, which had no -u after fo(u)r. This simplification carried over into modern English.

Definition of forty-five:
Numeral, a cardinal number that represents the quantity or count of 45
The marathon runner finished the race in just under forty-five minutes, breaking her personal record.
My grandfather still has a collection of vintage forty-fives from his favorite rock bands of the 1970s.

Collocations with forty-five:
Some of the most commonly used collocations include:
1. Forty-five minutes: a duration of time, often used in contexts like travel, sports, or scheduling.
The train to the city takes forty-five minutes to arrive.
2. Forty-five degrees: refers to an angle (geometry) or temperature (weather, cooking, etc.).
The gymnast bent her knees at a perfect forty-five degrees before landing.
3. Forty-five percent: a proportion or percentage, often used in math, surveys, or statistics.
Only forty-five percent of voters turned out during the election.
4. Forty-five RPM: refers to a type of vinyl record that spins at 45 revolutions per minute.
The old jukebox only plays forty-five RPM records.

Incorrect spelling, explanation: the spelling fourtyfive is a mistake because forty is the correct and standard spelling of the number 40 in English. The spelling of forty is an exception to the typical pattern of adding -ty to the base number (e.g., twenty, thirty, fifty). In English grammar, numbers between 21 and 99 that are written as words must be hyphenated when they are compound (i.e., made up of two parts). This rule applies regardless of whether the number is used as a noun, adjective, or part of a sentence. Fourtyfive is incorrect because it’s a misspelling (should be forty) and lacks the necessary hyphen.

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling