Let's master the art of rounding to make math easier!
让我们掌握凑整法，让数学变得更简单！
Chapter 1 / 第一章
CH1 计算与巧算
CH1 计算与巧算
CALCULATION & CLEVER METHODS
凑整法
ROUNDING METHOD
XP Reward
+500 XP
Time Est.
15 MIN
Difficulty
NOVICE