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Grade: 8,    Subject: Math,    Topic: Number and Number Sense Number Manipulation Order decimals, Fractions, Percents, and Scientific Notation
Question 1:
Five-ninth of 6.3 × 1019 = ______

3.5 × 10195.9 × 1019

9.2 × 10196 × 1019
 
Question 2:
A plant grows 2.75 times every month. Gardner trims 50% of its height every month on last day of the month. The plant was 100 cm tall on Jan 1st. How tall will it be on March 31st after trimming?

about 100 cmabout 137.5 cm

about 189 cmabout 260 cm
 
Question 3:
Company ABC has to spend $65 for every $100 they receive by selling computer hardware. They have to pay 25% tax on the profit. How many dollars for every $100 do they finally receive as profit after tax?

$10$8.75

$26.25$35
 
Question 4:
A colony of bacteria had a population of 5.92 × 108. The population doubled during first week. Next week, after a treatment the population reduced by 95%. What is the population of bacteria now?

5.92 × 1085.92 × 107

5.92 × 1091.184 × 107
 
Question 5:
What is 55.5% of 7.98 × 1012?

3.29 × 10123.99 × 1012

4.4289 × 10122.4289 × 1012
 
Question 6:
Size of a galaxy is increasing 25% every year. Its current size is 5 × 1016 km; approximately how large will it be after 3 years?

5.25 × 1016 km6.25 × 1016 km

9.77 × 1016 km7.81 × 1016 km
 
Question 7:
Which of these numbers is bigger than 3,000,000?

75% of 9.0 × 105200% of 2.0 × 105

100% of 3.0 × 10650% of 3.0 × 107
 
Question 8:
There were 8 × 108 pathogens in a sample. Number of pathogen increased to 1.2 × 109. What was the increase in percentage?

12%50%

25%33%
 
Question 9:
Price of a candy increased from 0.5 dollar to 0.65 dollar. Write this increase in % terms.

10%20%

30%40%
 
Question 10:
Mark receive three fourth of a treasure. He gave 25% to his son, 35% to his daughter and rest to the charity. What fraction of the original treasure did the charity get?

thth

thth
 
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