Use rounding to estimate the answer to the subtraction
problem.

97 - 41	??? 50 40 30 10 70 20 60
36 - 22	??? 50 40 30 10 70 20 60
57 - 32	??? 50 40 30 10 70 20 60
71 - 47	??? 50 40 30 10 70 20 60
88 - 69	??? 50 40 30 10 70 20 60
43 - 19	??? 50 40 30 10 70 20 60
51 - 32	??? 50 40 30 10 70 20 60
77 - 38	??? 50 40 30 10 70 20 60
67 - 23	??? 50 40 30 10 70 20 60
92 - 78	??? 50 40 30 10 70 20 60
38 - 11	??? 50 40 30 10 70 20 60
89 - 47	??? 50 40 30 10 70 20 60
69 - 8	??? 50 40 30 10 70 20 60
58 - 39	??? 50 40 30 10 70 20 60
87 - 79	??? 50 40 30 10 70 20 60
47 - 12	??? 50 40 30 10 70 20 60
73 - 32	??? 50 40 30 10 70 20 60
79 - 49	??? 50 40 30 10 70 20 60
81 - 57	??? 50 40 30 10 70 20 60
87 - 17	??? 50 40 30 10 70 20 60