2 1\2 + 3 1\2=?
6 or 5 2\2
3 1\2 - 2 1\2 =
1
2 1\5 + 3 1\5
5 2\5
3 1\5 - 2 1\5 =
7\12 + 3\12
10\12
11\12 - 3\12 =
8\12
2\5 + 2\5 =
4\5
7\12 - 3\12 =
4\12
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