Trace: Add by 6

Add by 6

6+1=7
6+2=8
6+3=9
6+4=10
6+5=11
6+6=12
6+7=13
6+8=14
6+9=15
1+6=7
2+6=8
3+6=9
4+6=10
5+6=11
6+6=12
7+6=13
8+6=14
9+6=15

Quiz: Add by 6

2+6=
6+2=
8+6=
6+4=
6+3=
7+6=
6+1=
6+8=
3+6=
6+6=
6+7=
5+6=
1+6=
4+6=
6+5=
6+6=
6+9=
9+6=