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