1 sentence for 算数 (suàn​shù — valid)

1. 既然签了合同，我们说的话就要算数。

   jì​rán qiān le hé​tong, wǒ​men shuō de huà jiù yào suàn​shù.

   Now that we've signed the contract, we must stand by our word.

   Source: Dong Chinese Dictionary