102. 17/200+68/200-20/200=65/200=13/10
103. 28/100-6/100+17/100=39/100
108. (-16/35):64=(-16/35)*1/64=-1/140
109. (7 9/9-1 1/9)*9=6 8/9*9=62/9*9/1=62
110. 10-2/1*5/1=10-10=0
111. 5/2*1/10-1/3=1/4-1/3=3/12-4/12=-1/12
112. 1/16+3/8*8/3=1/16+1=1 1/16
113. 7/10:(11/15-3/15)=7/10:8/15=7/10*15/8=21/16=1 5/16
114. 20/1*5/4-7/23=25-7/23=24 16/23
115. (12/8-5/8):9/8=7/8*8/9=7/9
116. 35/42=5/6; 13/78=1/6; 75/100=3/4
117. 42/63=2/3; 70/80=7/8; 180/195=36/39=12/13
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Answers & Comments
102. 17/200+68/200-20/200=65/200=13/10
103. 28/100-6/100+17/100=39/100
108. (-16/35):64=(-16/35)*1/64=-1/140
109. (7 9/9-1 1/9)*9=6 8/9*9=62/9*9/1=62
110. 10-2/1*5/1=10-10=0
111. 5/2*1/10-1/3=1/4-1/3=3/12-4/12=-1/12
112. 1/16+3/8*8/3=1/16+1=1 1/16
113. 7/10:(11/15-3/15)=7/10:8/15=7/10*15/8=21/16=1 5/16
114. 20/1*5/4-7/23=25-7/23=24 16/23
115. (12/8-5/8):9/8=7/8*8/9=7/9
116. 35/42=5/6; 13/78=1/6; 75/100=3/4
117. 42/63=2/3; 70/80=7/8; 180/195=36/39=12/13