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teach
Adding Grid
Math
Look at the grid below and fill in the missing squares.
+
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
1
12
2
5
3
10
4
16
5
11
6
14
7
20
8
10
17
9
20
10
23
11
15
12
27
13
18
14
17
15
24
