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

1.8 7 =   26.5 5 =
2.4 4 =   27.5 2 =
3.4 4 =   28.3 1 =
4.7 5 =   29.5 5 =
5.6 3 =   30.3 2 =
6.9 3 =   31.7 3 =
7.8 5 =   32.7 4 =
8.3 3 =   33.6 3 =
9.5 5 =   34.4 4 =
10.9 4 =   35.8 3 =
11.8 2 =   36.8 6 =
12.9 6 =   37.2 1 =
13.7 4 =   38.2 1 =
14.9 8 =   39.8 5 =
15.9 1 =   40.6 3 =
16.6 4 =   41.5 2 =
17.9 5 =   42.8 2 =
18.4 3 =   43.5 4 =
19.4 4 =   44.9 4 =
20.4 2 =   45.7 6 =
21.5 3 =   46.8 1 =
22.4 4 =   47.9 5 =
23.7 6 =   48.5 5 =
24.7 5 =   49.2 1 =
25.3 3 =   50.7 1 =