三下五除二

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Chinese[edit]

three
 
under; second; next; lower; below; underneath; down(wards); to decline; to go down; latter
five
 
remove; do away with; wipe out; divide; except
two
simp. and trad.
(三下五除二)
Literally: “three, down five, take away two”.

Etymology[edit]

A mnemonic device to aid with adding 3 to 2, 3 and 4 in base 10 (also 7, 8 and 9 in base 16).

  • Ex.
    1. Start with three beads on the bottom (each lower bead is equal to 1).
    2. Move one of the top beads down (each top bead is equal to 5).
    3. Take away two of the beads from the bottom.
    4. This leaves you with one top bead (5) and one bottom bead (1), for a total of 6.
Step 1 Step 2 Step 3

Pronunciation[edit]


Idiom[edit]

三下五除二

  1. in an instant; in the blink of an eye; quickly and easily