èr​yī​tiān​zuò​wǔ

abacus mnemonic

Senses

二一添作五 èr​yī​tiān​zuò​wǔ abacus mnemonic

A rule in abacus reckoning for dividing by two, where 1 becomes 0.5 (literally: 1 divided by 2 is 0.5)

二一添作五 èr​yī​tiān​zuò​wǔ to share fifty-fifty

To share equally between two parties; to go halves

References

synonym 三一三十一/三一三十一 二一添作五/二一添作五