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

1.49 9 =   26.99 9 =
2.2 2 =   27.9 7 =
3.76 1 =   28.29 9 =
4.55 3 =   29.65 2 =
5.75 2 =   30.99 8 =
6.6 6 =   31.68 1 =
7.83 2 =   32.97 6 =
8.47 4 =   33.9 2 =
9.33 1 =   34.87 3 =
10.87 6 =   35.18 5 =
11.53 2 =   36.36 5 =
12.51 1 =   37.86 4 =
13.64 3 =   38.37 6 =
14.79 7 =   39.35 5 =
15.49 2 =   40.51 1 =
16.86 5 =   41.7 2 =
17.36 3 =   42.9 7 =
18.67 2 =   43.36 1 =
19.98 6 =   44.76 5 =
20.86 4 =   45.72 1 =
21.97 4 =   46.59 2 =
22.99 4 =   47.68 8 =
23.77 1 =   48.33 2 =
24.87 5 =   49.79 7 =
25.59 7 =   50.4 4 =