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

1.89 5 =   26.59 4 =
2.87 7 =   27.89 7 =
3.55 5 =   28.49 7 =
4.49 4 =   29.67 4 =
5.78 2 =   30.28 5 =
6.37 5 =   31.88 4 =
7.9 8 =   32.65 4 =
8.15 2 =   33.6 6 =
9.66 3 =   34.64 2 =
10.89 4 =   35.88 2 =
11.56 2 =   36.45 3 =
12.89 2 =   37.19 9 =
13.54 3 =   38.88 5 =
14.4 1 =   39.96 6 =
15.39 4 =   40.15 5 =
16.77 1 =   41.37 6 =
17.34 2 =   42.15 4 =
18.85 2 =   43.59 6 =
19.13 3 =   44.5 1 =
20.24 3 =   45.84 2 =
21.97 6 =   46.88 2 =
22.77 1 =   47.53 3 =
23.9 4 =   48.54 3 =
24.84 4 =   49.78 1 =
25.88 2 =   50.35 3 =