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

1.2 1 =   26.88 1 =
2.88 6 =   27.85 4 =
3.97 4 =   28.75 4 =
4.37 2 =   29.95 5 =
5.58 5 =   30.35 5 =
6.48 8 =   31.17 2 =
7.31 1 =   32.53 3 =
8.25 2 =   33.15 2 =
9.25 3 =   34.99 5 =
10.88 1 =   35.96 2 =
11.57 1 =   36.2 2 =
12.27 4 =   37.34 2 =
13.89 5 =   38.87 3 =
14.25 4 =   39.37 2 =
15.58 8 =   40.58 5 =
16.67 4 =   41.92 2 =
17.88 3 =   42.1 1 =
18.47 7 =   43.85 2 =
19.76 1 =   44.89 5 =
20.25 4 =   45.28 1 =
21.42 1 =   46.23 3 =
22.49 9 =   47.89 9 =
23.85 4 =   48.8 1 =
24.78 1 =   49.9 3 =
25.88 4 =   50.36 4 =