EASY SUBTRACTION. Be able to answer this in less than one minute.

1.6 5 =   26.6 3 =
2.7 2 =   27.3 2 =
3.7 6 =   28.6 5 =
4.7 4 =   29.1 1 =
5.4 2 =   30.6 4 =
6.9 7 =   31.9 5 =
7.9 4 =   32.4 1 =
8.5 4 =   33.7 7 =
9.8 3 =   34.5 1 =
10.6 1 =   35.7 1 =
11.8 4 =   36.4 3 =
12.1 1 =   37.8 6 =
13.6 4 =   38.9 6 =
14.8 1 =   39.9 5 =
15.6 3 =   40.5 1 =
16.9 4 =   41.7 3 =
17.9 3 =   42.8 4 =
18.8 4 =   43.7 5 =
19.7 5 =   44.6 2 =
20.3 2 =   45.3 1 =
21.5 4 =   46.9 7 =
22.4 2 =   47.9 7 =
23.9 7 =   48.2 1 =
24.9 2 =   49.9 5 =
25.9 2 =   50.9 4 =