小学数学一年级口算题：5以内的减法

(1)1 - 1 =

(2)3 - 1 =

(3)1 - 1 =

(4)4 - 1 =

(5)1 - 1 =

(6)3 - 3 =

(7)1 - 1 =

(8)4 - 4 =

(9)1 - 1 =

(10)2 - 1 =

(11)3 - 1 =

(12)4 - 4 =

(13)2 - 1 =

(14)3 - 2 =

(15)4 - 1 =