【导语】口算是数学教学方法之一。一种只凭思维及语言活动不借任何工具的计算方法。它能培养学生快速的计算，发展学生的注意、记忆和思维能力。口算熟练后有助于笔算，且便于在日常生活中应用。以下是整理的相关资料，希望对您有所帮助！
（一）
2 + 1 = 4 + 1 = 1 + 2 =
2 + 2 = 4 + 1 = 2 + 1 =
4 + 1 = 3 + 1 = 1 + 2 =
3 + 1 = 4 + 1 = 1 + 2 =
1 + 3 = 1 + 2 = 3 + 2 =
3 + 1 = 3 + 2 = 4 + 1 =
（二）
3 - 2 = 1 - 1 = 1 - 1 =
2 - 2 = 1 - 1 = 4 - 2 =
3 - 1 = 3 - 2 = 4 - 1 =
4 - 1 = 1 - 1 = 2 - 2 =
1 + 3 = 3 - 1 = 3 - 3 =
2 + 3 = 2 - 2 = 3 - 1 =
（三）
2 + 3 = 2 + 1 = 3 - 2 =
3 - 2 = 3 + 2 = 2 + 1 =
3 + 2 = 1 + 1 = 3 + 2 =
1 + 1 = 1 - 1 = 3 + 1 =
2 + 1 = 4 + 1 = 2 + 3 =
2 - 2 = 3 - 1 = 1 - 1 =
（四）
8+2+1= 6+2+2= 7+3+1=
6+1+2= 1+3+4= 9+1+1=
8+1+1= 8+1+2= 8+1+2=
5+2+4= 2+3+2= 9+1+1=
2+6+3= 5+2+3= 9+1+1=
5+2+2= 3+2+2= 1-1+6=
（五）
9+1+1= 3+7+1= 1+5+1=
1-1+5= 3-1+3= 1-1+9=
10-4+1= 3-2+6= 6-5+3=
1-1+10= 6-5+1= 4-2+5=
8-2+3= 6-3+2= 10-1+0=
2-1+6= 8-3+1= 2-1+8=
http://m.scabjd.com/xiaoxue/138091/
