Adding on the Number Line
5+3
8
9-6
3
15
25
65
55
What number is halfway between 0 and 10?
5
4+5
9
5-1
4
37
47
41
31
What number is halfway between 0 and 20?
10
8+2
10
10-7
3
69
79
78
68
What number is halfway between 0 and 100?
50
40+20
60
80-40
40
102
112
101
91
What number is halfway between 0 and 50?
25
30+60
90
70-50
20
110
120
118
108
What number is halfway between 0 and 60?
30