When we count the teen numbers we usually accent the first syllable: THIRteen, FOURteen, FIFteen, SIXteen, and so on.
However, FIFteen can sound similar to “fifty”, so when we say these numbers by themselves we can accent the second syllable instead:
“I am 30. She is 13.”
For more practice with this concept you can watch my new YouTube video: https://youtu.be/DYdJP3ymZxI
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