20以内不进位加法不退位减法口算练习

20以内不进位、不退位加减法练习（一）时间对题姓名10 + 3=10-2 =15-3=9-2 =12+ 1 =7- 1 =12 + 5 =6+ 3 =1+ 8=14 + 4=2+ 7=7+ 3=16+