(1) positive; counter

(2) three quarters; Four Thirds

(3) Three-eighths; two fifths

(4) 63 out of 256 people

(5) the relationship between each quantity and the total amount

(6)26.7; 28.5; 30

(7) a quarter; One-half; three-fourths

choose

( 1)、( 1)、(4)、(2)、( 1)

To solve practical problems

1

( 1) 108、 109、 1 10

(2) Answer: It is more appropriate to use the average value to represent the score of this 10 student, because there are more students close to the average value, so it is more appropriate.

2

The title of this question is wrong, so the beginning should be changed from 240 students in the sixth grade of Haitian Primary School to 240 students now.

240× 5/8 = 150 (person)1-2/5 = 3/5150 ÷ 3/5 = 250 (person) answer; There are 250 students.

three

100 ÷ 2 = 50 (km) 50× 7 = 350 (km) 360 km > 350 km A: You can't finish the race within the planned time.

four

(1) A: The number of people who participate in the sports group is the largest, and the number of people who participate in the art group is the least.

(2)2: 1 1:2

(3) 60%-10% = 50% 20 ÷ 50% = 20 ÷ 0.5 = 40 (people) A: a * * *, there are 40 people.

(4) 60%+10% = 70% 40× 70% = 40× 0.7 = 27 (person). A * * *, 28 people.

five

1×4=4 (m) Large: 4 m in circumference.

Oh, I'm exhausted! ! You must thank me! ! Besides, you're okay ~ ~