20以内进位加法退位减法口诀表
20以内进位加法口诀表9 + 2 = 118 + 3 = 117 + 4 = 116 + 5 = 115 + 6 = 114 + 7 = 113 + 8 = 112 + 9 = 119 + 3 = 1
20以内进位加法退位减法口诀表