(2)2/ 15+2/ 15=4/ 15

(3) What is the * * * ratio in the third and fourth grades?

2/ 15+3/ 15=5/ 15= 1/3

How many points is the fifth grade more than the first grade?

3/ 15-2/ 15= 1/ 15

What is the percentage of grade one to grade five?

2/ 15+2/ 15+2/ 15+3/ 15+3/ 15= 12/ 15=4/5

6、( 1)2/ 1 1+3/ 1 1+5/ 1 1= 10/ 1 1

(2) 1- 10/ 1 1= 1/ 1 1

7.> < = =

8. You can fill in this question according to the approximate time of your activities, for example, 8/24 of the rest time, 2/24 of the exercise time and 14/24 of other time, and then ask questions according to the time provided.

(1) What is the proportion of rest time more than exercise time?

8/24-2/24=6/24= 1/4