Making 10s
5 + ? = 10
5
10
20
33
27
20 and 7
35 + 0 =
35
1 + ? = 10
9
40
50
14
24
13
10 and 3
60 + 15 =
75
7 + ? = 10
3
0
10
77
87
40 and 1
50 + 20 =
70
2 + ? = 10
8
70
80
91
101
66
60 and 6
30 + 35 =
65
6 + ? = 10
4
90
100
124
134
94
90 and 4
90 + 25 =
115