A.2per15-1per2+3per10 B.3per7+4per21-13per14 C.4 3per5-1 1per3+2 3per4 D.10 1per4+1 2per3+20 7per8 E.2,25+25%+1 1per2

a. 2/15-1/2+3/10 =4-15+9/30 = -2/30 = -1/15
c. 4 3/5 - 1 1/3 +2 3/4
(4-1+2) 3/5-1/3+3/4
(5)36-20+45/60
(5) 61/60
=6 1/60
d 10 1/4+1 2/3+ 20 7/8
(10+1+20) 1/4+2/3+7/8
(31) 6+16+21/24
(31) 43/24
32 19/24
e. 225/100+25/100+1 1/2
225/100+25/100+3/2
225+25+150/100
400/100
4