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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 × 10
^{19}
= ______
3.5 × 10
^{19}
5.9 × 10
^{19}
9.2 × 10
^{19}
6 × 10
^{19}
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 cm
about 137.5 cm
about 189 cm
about 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 × 10
^{8}
. 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 × 10
^{8}
5.92 × 10
^{7}
5.92 × 10
^{9}
1.184 × 10
^{7}
Question 5:
What is 55.5% of 7.98 × 10
^{12}
?
3.29 × 10
^{12}
3.99 × 10
^{12}
4.4289 × 10
^{12}
2.4289 × 10
^{12}
Question 6:
Size of a galaxy is increasing 25% every year. Its current size is 5 × 10
^{16}
km; approximately how large will it be after 3 years?
5.25 × 10
^{16}
km
6.25 × 10
^{16}
km
9.77 × 10
^{16}
km
7.81 × 10
^{16}
km
Question 7:
Which of these numbers is bigger than 3,000,000?
75% of 9.0 × 10
^{5}
200% of 2.0 × 10
^{5}
100% of 3.0 × 10
^{6}
50% of 3.0 × 10
^{7}
Question 8:
There were 8 × 10
^{8}
pathogens in a sample. Number of pathogen increased to 1.2 × 10
^{9}
. 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?
th
th
th
th
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