1/21 + 2/7; 5/10+2/3; 2 1/15+3/5; 1 1/2 + 3 2/3.

Question

1/21 + 2/7; 5/10+2/3; 2 1/15+3/5; 1 1/2 + 3 2/3.

Answer 1

1/21+2/ 7=7/21=1/3
5/10+2/3=15/30+20/30= 35/30=1 5/30=1 1/6
2 1/15+3/5=2 1/15+9/15=2 10/15= 2 2/3
1 1/2+3 2/3=1 3/6+3 4/6=4 7/6=

Answer 2

1/3
1,1/6
2,2/3
9,1/6.