"Focus on the units column first! If the sum is greater than 9, don't forget the carry!" /
"先看个位！如果和大于9，别忘了进位！"
CHAPTER 6: VERTICAL PUZZLES / 第六章：竖式谜题
巧填
巧填
竖式
Vertical Puzzles
Fill in the missing digits in vertical addition and subtraction puzzles! /
填入竖式加减法中缺失的数字！
ESTIMATED TIME
schedule
30:00 MINS
MISSION REWARD
emoji_events
150 XP
DifficultyLvl 25 Expert