One, one. This is pronounced the exact same way as the word won, as in, ‘We won the game’. Two starts with the T sound: tt, tt, where the teeth are together, the tongue is behind them, tt, and pulls back to release air.
Two. It then has the ‘oo’ as in ‘boo’ vowel sound [u]. Two. And if you’ll notice, the lips begin to take that position even – tt – before the T sound. Two, two. And this is pronounced the exact same way as the word too, T-O-O, as in, ‘I want to go too’. Or, to, T-O, as in, ‘He is going to the store’, although to be honest, that word is often reduced to: t’. He is going t’ the store.
Three. This begins with the unvoiced TH sound [θ]: th. Make sure your tongue comes through those teeth, it’s the only way to make that sound. Th, th, thr-. It then pulls back into the R position. So your tongue will move from being through the teeth to being further up and back. Thr-. Then the ‘ee’ as in ‘she’ vowel sound. Three, three.
Four begins with the F sound, so the bottom lip must move up to the top teeth. Four. It then opens into the ‘oh’ as in ‘no’ diphthong, four, before moving into the R consonant sound. Four, four.
Source:
https://rachelsenglish.com/pronounce-numbers-1-10/