小学数学20以内加减法口算100题-19天练习册

10 + 8 =10 + 2 =13 + 2 =8+2+3=8+10 =17-7 =19-3 =9+1+4=18-8 =10 + 8 =3+11 =7+3+5=18-10 =3+10 =16 — 4