廾 升 艹 廿

 廾　升　艹　廿 These looks similar but have different and sometimes unrelated meanings.

廾Gǒng Two hands of one person joined together working a task.
When combined with other characters usually appears as the lowest element of the character.

升shēng Two hands of one person joined together LIFTING UP an object.
When combined with other characters usually appears as the lowest element of the character.

艹cao3 two sprouts of grass this always appears on top of a character. It is a determinant which indicates the object has something to do with vegetation (but not wood or bamboo).

廿niàn means 20 it is two 10s 十　linked　together. Two tens make 20.

"All is number." Pythagoras