1:
.
6
+ 7
2:
8
+ 9
3:
7
+ 8
4:
7
- 4
5:
9
- 8
6:
.
8
- 4
7:
.
6
+ 5
8:
4
+
4
9:
8
+ 8
10:
.
18
- 9
11:
14
- 7
12:
15
- 2
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2001 Teaching Treasures Publications