心算

xīn suàn gāo shǒu

心算高手

lightning calculator

xīn suàn néng lì

心算能力

ability of mental arithmetic

wǒ bù néng xīn suàn chu lai wǒ děi yòng jì suàn qì

我不能心算出来，我得用计算器。

I can't work it out in my head. I need a calculator.

tā zài xīn suàn suǒ yǒu huā xiāo

他在心算所有花销。

He was reckoning up the cost of everything in his mind.