Standard way of counting in Japanese, for eg counting money. However, some objects/things are counted differently.
{漢語|かんご}
いち、に、さん、し・よん、後、ろく、しち・なな、はち、く・きゅう
- し、く given alternative sounds because of superstition (death and agony)
- しち given alternative sound because sounds too much like いち
Memorize which pronunciation to use in which case! よん、なな、きゅう are the “preferred” pronunciation in most cases
{百|ひゃく}
3/6/8 has changes
- さんびゃく
- ろっぴゃく
- はっぴゃく
4/7/9 uses preferred pronunciation
- よんひゃく
- ななひゃく
- きゅうひゃく
{千|せん}
3/8 has changes
- さんぜん
- はっせん
4/7/9 uses preferred pronunciation
- よんせん
- ななせん
- きゅうせん
{万|まん}、{億|おく}、{兆|ちょう}
10k, 100M, 1T
{大和言葉|やまとことば}・{和語|わご}
{一つ|ひとつ}、{二つ|ふたつ}、{三つ|みっつ}、{四つ|よっつ}、{五つ|いつつ}、{六つ|むっつ}、{七つ|ななつ}、{八つ|やっつ}、{九つ|ここのつ}、{十|とお}
Typically only used up to 10