Trace: Add by 8

Add by 8

8+1=9
8+2=10
8+3=11
8+4=12
8+5=13
8+6=14
8+7=15
8+8=16
8+9=17
1+8=9
2+8=10
3+8=11
4+8=12
5+8=13
6+8=14
7+8=15
8+8=16
9+8=17

Quiz: Add by 8

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