四捨五入

四 = 儿 + 囗 : Mnemonic symbol: a four-leaved clover. Socrates (s) is working out in the bathroom of the space station (Ø4). He's lifting four (四) wooden boxes (囗), and wonders why they are so heavy. He doesn't know that inside one of the four boxes, the monkey king (儿) is hiding and secretly laughing at him - until the monkey king comes out and surprises Socrates with a four-leaved clover (四).

舍 = 人 + 舌 : Mnemonic symbol: a pawn who is abandoned to save the king.

Neanderthal Man (人) is so hungry that he opens his mouth, sticks out his tongue (舌) and is about to devour Sherlock Holmes (sh) in the elevator (e3), but Sherlock Holmes acts quickly enough to throw a pawn (舍) onto Neanderthal Man's tongue so that he munches the pawn instead.

五 = 王 + 丨 : Mnemonic symbol: a pentagram.

Martin Luther King (王) helps Willy Walrus (w) to construct a pentagram (五) out of dinosaur bones (丨) inside the space station (Ø3).

五 = 工 + 乛 : Mnemonic symbol: a pentagram.

In the space station (Ø3), Willy Walrus (w) chops up a steel beam (工) with a sickle (乛) into five (五) equal parts. He uses the five parts to assemble a steel pentagram (五).

入 = 丿 + ㇏ : Mnemonic symbol: an enter key like on a computer keyboard.

There is a special area in the space station's bathroom (Ø4) which is filled with bananas (丿), but you have to hit an enter key (入) to enter (入). Rachel Rhinoceros (ru) uses a finger (㇏) to press the button and get access to the bananas.