Percentage

Q1: What is Percentage in Math?

A number multiplied by 100
A number divided by 100
A number or ratio expressed as a fraction of 100.
A number or ratio expressed as a fraction of 1000.
Good answeres: 1

Q2: Select true statements:

Percentages are often used to express a proportionate part of a total.
Percentage is never bigger than 100%
Percentage is never a negative number
Good answeres: 1

Q3: If 50% of the total number of students in the class are male, can we know the number of total students in class?

No, this is not enough information
We know only the total number of male students
Yes, total number is known in this case
Good answeres: 1

Q4: Select answeres where we have 25% female in group:

25 females out of 100
25 females out of 200
50 females out of 200
There are 25% male students in group out of 100
There are 75% male students in group out of 100
Good answeres: 3

Q5: 50 apples as a percentage of 1250 apples =

50%
50 / 1250 = 0.04 %
50 / 1250 × 100 = 4%
Good answeres: 1

Q6: What is the 50% of 40%?

100/100 - (50/100 × 40/100) = 1 - (0.5 × 0.4) = 1 - 0.2 = 80%
50/100 × 40/100 = 0.5 × 0.4 = 0.2 = 20%
(50+40)/100 = 0.9 = 90%
100/100 - (50+40)/100 = 1-0.9 = 0.1 = 10%
Good answeres: 1

Q7: In container we have 150 smartphones. 60% of them are BLACK. 20% of BLACK phones have ANDROID system. What is the percentage of BLACK ANDROID in container?

12%
20%
30%
40%
80%
Good answeres: 1

Q8: In container we have 150 phones and 16% of them are red. How many red phones we have in container?

16 red phones
24 red phones
32 red phones
48 red phones
Good answeres: 1

Q9: In box we have 20 yellow apples and this is 40% of total amount. How many apples we have in box?

20 apples
28 apples
50 apples
60 apples
Good answeres: 1

Q10: 25% =

0.25 / 100
25 / 100
25% / 100
Good answeres: 1

Q11: An increase of 100% = new amount is..

doubled
increased by 100
100% of the original
200% of the original
Good answeres: 2

Q12: An increase of 100% on 20 dollars will result new price of:

$20
$30
$40
$120
Good answeres: 1

Q13: An increase of 800% on 1 dollar. What is the new price?

8 dollars
9 dollars
801 dollars
Good answeres: 1

Q14: A decrease of 60% =

40% of the original
60% of the original
Good answeres: 1

Q15: $120 price + decrease by 20%. What is new price?

$96
$100
$104
Good answeres: 1

Q16: We had 1000 boxes. If number of boxes is decreased by 100% how many boxes we have?

0
100
900
1000
Good answeres: 1

Q17: The number is increased by 50% then decreased by 50%. What is the new amount?

same as original number (original+50-50)
75% of original number (original×1.5×0.5)
Good answeres: 1

Q18: The price was increased by 25%. What is the % of decrease to get original price?

20%
25%
75%
80%
Good answeres: 1

Q19: 50% of citizens voted on election. This is 10% of increase compared to previous year. What was the % in previous year?

it was 40% (50% - 10%)
it was 45% (50% - 50% × 0.1)
Good answeres: 1

Q20: 50% of citizens voted on election. This is 10 percentage points of increase compared to previous year. What was the % in previous year?

it was 40% (50% - 10%)
it was 45% (50% - 50% × 0.1)
Good answeres: 1

Q21: If we increase amount by 10% twice, new amount is:

10% + 10% = 20% of original
100 + 2 × 10% = 120% of original
1.1 × 1.1 = 1.21 = 121% of original
2 × 100 = 200% of original
Good answeres: 1

Q22: In Petri dish we have 1 million bacteria. Their growth rate is continuously 20% per week. What is the amount of bacteria after 3 weeks?

1.2 millions
1.44 millions
1.6 millions
1.728 millions
Good answeres: 1