Find the LCD and make the fraction similar. Perform the indicated operation. Rename the fraction to simplest form or make it as mixed fraction is possible.
Answer:Step-by-step explanation:1)9/10=18/201/4=5/2018/10-5/20=13/202)15/20=15/202/5=8/2015/20-8/20=7/203)4 1/4=51/122/3=8/1251/12-8/12=43/12 or 3 7/124)2 1/5=44/203/4=15/2044/20-15/20=29/20 or 1 9/205)12/15=12/153/5=9/1512/15-9/15=3/15 or 1/5