口算:260÷2= 210÷2=106÷2= 108÷2=
10×1=____10×2=____10×3=____10×4=____
41+7= 43+4= 47+7= 48+8=81+7= 83+4= 87+7= 88+8=
76+5= 78+3= 72+9= 77+7=
63+9= 65+7=64+8= 67+9=
52+7= 56+7= 58+4= 59+6=