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

1.72 18 = ______________  26.56 52 = ______________
2.37 23 = ______________  27.56 18 = ______________
3.94 58 = ______________  28.83 60 = ______________
4.93 65 = ______________  29.76 20 = ______________
5.57 50 = ______________  30.73 26 = ______________
6.43 21 = ______________  31.92 33 = ______________
7.37 16 = ______________  32.76 52 = ______________
8.43 17 = ______________  33.89 36 = ______________
9.75 35 = ______________  34.96 68 = ______________
10.99 15 = ______________  35.83 70 = ______________
11.47 25 = ______________  36.51 48 = ______________
12.82 56 = ______________  37.57 55 = ______________
13.63 52 = ______________  38.45 20 = ______________
14.46 33 = ______________  39.45 38 = ______________
15.89 70 = ______________  40.46 28 = ______________
16.60 12 = ______________  41.96 87 = ______________
17.71 50 = ______________  42.48 45 = ______________
18.92 37 = ______________  43.45 45 = ______________
19.64 48 = ______________  44.58 19 = ______________
20.59 44 = ______________  45.91 14 = ______________
21.36 21 = ______________  46.72 46 = ______________
22.39 24 = ______________  47.95 95 = ______________
23.57 53 = ______________  48.99 67 = ______________
24.79 63 = ______________  49.64 63 = ______________
25.34 26 = ______________  50.60 46 = ______________