Counting on by 10's
10+10=
20
10+20=
30
4+4=
8
10-10=
0
30-20=
10
25+10=
35
20+20=
40
8+8=
16
40-10=
30
70-20=
50
52+10=
62
41+20=
61
9+9=
18
84-10=
74
89-20=
69
12+10=
22
77+20=
97
30+30=
60
36-10=
26
48-20=
28
96+10
106
96+20=
116
60+60=
120
104-10=
94
105-20=
85