One Two Three Four Five Six Seven Eight Nine Tenyī èr sān sì wǔ liù qī bā jiǔ shí一 二 三 四 五 六 七 八 九 十  

It's not hard, only 10 numbers, the pronunciation and tones are a bit more difficult. Try something online or ask someone to coach you.

I learnt them as a novelty, but quite frankly, like the language, it serves no real purpose. Mandarin is not a world language, and has very little use outside China.

Go out in the market and practice by asking how much and using it there. 

Practice Male to Male Sounds   if your Male  as Male to Female sounds Differ.

Female sounds are on a different Level while all basics are the same Male Pronunciations are Prominent at Parties and Functions to be incorrect Following what Your Female Partner or Secretary tells you. Police English Rank Detective explained  to me Man Sounds and Tones Good Luck Google China  Beijing /Dalian /Sounds

ee, are, san, sir, woo, lil, chee, bar, joe, sher. 

 yī    1èr    2sān  3sì     4

wǔ   5liù   6qī   7bā  8jiǔ 9

shí     10

 yī    1èr    2sān  3sì     4

wǔ   5liù   6qī   7bā  8jiǔ 9

shí     10

Once you learn to say all of them, next you must learn the hand signal too, so you can communicate in loud open markets. If they try to over-charge you and piss you off just use your middle finger, it seems like all Chinese know what that means.