xīn​suàn

mental arithmetic

Senses

心算 xīn​suàn mental arithmetic

to calculate in one's head without using tools; mental calculation

心算 xīn​suàn to plan

(literary) to plan or prepare in one's mind

References

antonym 心算/心算 笔算/筆算
antonym 笔算/筆算 心算/心算