Addition & Subtraction to 20
12+7= 12 19 17 19-8= 11 12 7 10+7= 23 17 16 9-6= 7 11 3 11+9= 20 22 21 18-9= 12 23 9 10+11= 23 21 12 15-7= 7 8 67 25+10= 37 45 35 20-7= 13 10 23
12+7= 12 19 17 19-8= 11 12 7 10+7= 23 17 16 9-6= 7 11 3 11+9= 20 22 21 18-9= 12 23 9 10+11= 23 21 12 15-7= 7 8 67 25+10= 37 45 35 20-7= 13 10 23