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Addition and Subtraction

1.9 + 8 =
2.12 + 1 =
3.7 + 2 =
4.18 + 1 =
5.3 + 10 =
6.14 + 5 =
7.6 + 1 =
8.8 + 7 =
9.12 + 8 =
10.13 + 5 =
11.8 + 8 =
12.6 + 11 =
13.16 + 1 =
14.6 + 7 =
15.16 + 3 =
16.2 + 13 =
17.3 + 15 =
18.1 + 1 =
19.16 + 4 =
20.17 + 3 =
1.9 + 8 =
2.12 + 1 =
3.7 + 2 =
4.18 + 1 =
5.3 + 10 =
6.14 + 5 =
7.6 + 1 =
8.8 + 7 =
9.12 + 8 =
10.13 + 5 =
11.8 + 8 =
12.6 + 11 =
13.16 + 1 =
14.6 + 7 =
15.16 + 3 =
16.2 + 13 =
17.3 + 15 =
18.1 + 1 =
19.16 + 4 =
20.17 + 3 =