三下五除二

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Chinese

three
under; next; lower
under; next; lower; below; underneath; down(wards); to go down; latter
 
five
remove; do away with; wipe out
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

Step 1 Step 2 Step 3

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

For example, to calculate :

  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.

Pronunciation


Idiom

三下五除二

  1. (figurative) (doing things) in an instant; in the blink of an eye; quickly and easily