Addition
4+9=
3+2=
10+5=
13
5
15
6-1=
7-1=
5
6
1+1=
2
9-0=
9
1 + 6 = 7
7 − 1 = 6
6 + 1 = 7
7-6= 1
If 7+6=13 then...6 + ? = 13
7
9-4=
5
2+2=
4
4-4=
0
6 + 3 = 9
9 − 3 = 6
3 + 6 = 9
9-6= 3
6 + 5=
11
8-1=
7-2=
7
5
5 + 5=
10
5-0=
5
5 + 10 = 15
10 + 5 = 15
15 − 5 = 10
15-10=5
8 + 3 + 1=
2+ 5 + 2=
4+ 6 + 3=
12
9
13
8-2=
10-9=
6
1
6 + 6=
12
10-10=
0
14 − 4 = 10
10 + 4 = 14
4 + 10 = 14
14-10=4
20 + 14 + 12=
55 + 10 + 21=
46
86
9-5=
8-3=
9-6=
4
5
3
7+7=
14
67-0=
67
1 + 18 = 19
18 + 1 = 19
19 − 18 = 1
19-1=18