计算能力提升-100以内两位数(不进位不退位)加减竖式计算

100以内（两位数不进位不退位）加减56 - 35 =66 - 31 =15 + 42 =16 + 13 =33 - 11 =34 - 30 =41 + 15 =12 + 35 =89 - 88 =4