เรียนห้อง E.P. ก่อนเปิดเทอมมาฝึกโจทย์ Math Grade8 กัน

โจทย์วิชา Math Grade8

Ratio, Proportion, and Percent

1. In the figure, there are 2 pineapples, 2 pomelos, 1 jackfruit, 1 durian, 5 guavas, 4 mangoes, 7 rose apples, 1 bunch of bananas, among others. Write a ratio to compare the two quantities for each of the following problems :

1) Pineapples and durians 

2) Jackfruits and pomelos

3) Bunches of bananas and guavas 

4) Rose apples and mangoes.

Answer: 

1) The ratio of pineapples to durians is 2 : 1.

2) The ratio of jackfruits to pomelos is 1 : 2.

3) The ratio of hands of bananas to guavas is 1 : 5.

4) The ratio of rose apples to mangoes is 7 : 4.

2. Write the ratio to represent each of the following statements :

1) Supasinee drives 180 kilometers in 2 hours.

2) The lowest wage is 150 baht per day.

3) Eight workers can finish the work within 3 days.

4) A BTS skytrain travels at a speed of 80 kilometers per hour.

5) The distance of 1 centimeter on the floor plan represents 10 meters of actual distance.

Answer: 

1) The ratio of the time drives in hours to the distance in kilometers is 2 : 180 or 1 : 90.

2) The ratio of the wage in baht to the number of day is 150 : 1.

3) The ratio of the number of workers to number of days taken to finish the work is 8 : 3.

4) The ratio of the speed of BTS skytrain in kilometers to the time in hours is 80 : 1.

5) The ratio of the distance in a map in centimeter to the actual distance in meters is 1 : 10.

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3. A Thai flag is 80 centimeters wide and 1.4 meters long. Write the ratio to compare the flag’s width and length.

Answer: 

The ratio of the width in centimeters to the length in meters is 80 : 1.4.

4. Each day Sunita earns 35 baht and saves 5 baht. Write the ratio to compare the amount of money she saves to amount of money she earns.

Answer: 

The ratio of the money saved to the money Sunita earns is 5 : 35 or 1 : 7.

5. Nontaphat works off campus 4 hours a day. Write a ratio to compare the time he works off campus to one day.

Answer: 

The ratio of the time Nontaphat works off campus in hour to number of Nontaphat’s day = 4 : 1.