Question

solve 5 sums on addition and subtraction of rational numbers​

Answer 1

Answer:

(1) 2/3+7/8=

first take LCM of denominators of 3 and 8

LCM=24

2(8)+7(3)/24=16+21/24

=37/24

(2) 2/5-4/6=

LCM of 5 and 6 is 30

12-20/30=-18/30

=-6/10=-3/5

(3)6/7-4/7=6-4/7( denominators are same)

=2/7

(4)4/9+5/9=4+5/9(denominators are same)

=9/9=1

(5)9/8-7/9=

LCM of 8 and 9 is 72

81-56/72=25/72