Grade 8 Formative - Percentage

Write as percentage: 0.08 and 1/40

• 0.8% and 0.025%
• 8% and 2.5%
• 8% and 0.025%
• 0.8% and 0.04%

Answer explanation

0.08 written as a fraction is 8/100, which is equal to 8%

1/40 is 1 divided by 40 = 0.025

this could be written as 25/1000 or 2.5/100, which is 2.5%

or

you can convert it by multiplying 0.025 by 100% = 2.5%

Write as decimal: 27.4% and 48%

• 0.274 and 0.48
• 0.274 and 0.048
• 0.27 and 0.48
• 0.274 and 0.48

Answer explanation

Remember that percent means in every hundred.

27.4% = 27.4/100

then, you can move the decimal point 2 places to the left since 100 has 2 zeroes, so:

27.4/100 = 0.274

With the same method,

48% = 48/100 = 0.48

86% of trees in a forest were damaged in a forest fire. What fraction of the trees were not damaged?

• 7/50

• 0.14

• 43/50

• 14%

Increase 512 kg by 25%.

• 550 kg
• 640 kg
• 600 kg
• 700 kg

Louie brought 25 pumpkins to the market, and sold 18 of them.
What percentage of his pumpkins did he sell?

• 72%
• 45%
• 41.9%

• 28%

A class of 25 students had a math test. 24% of students gained an A, and 8 students gained a B.
How many students gained an A?

• 32

• 15
• 10

• 6

A hospital has 36 doctors who make up 30% of the total hospital staff.

How many people work at the hospital?

• 84

• 120

• 150

• 200

Answer explanation

Remember that 36 doctors = 30% of total staff.

You can find the total staff this way:

30% = 36

1% = 36/30 = 1.2

100% = 1.2 x 100% = 120

So, there are 120 staffs in total.

Julia bought a phone for$600, then sold it three years later for $120.

What percentage was her loss from the cost price?

• $360

• $480

• 20%

• 80%

A bottle of perfume in Singapore sells for $64.20, already including 7% GST.

Find the price of the perfume before the tax was added.

• $68.69

• $59.70

• $60
• $55

Answer explanation

Remember that $64.20 was the price AFTER it adds the 7% tax. Therefore,

107% = $64.20

1% = $64.20/107 = $0.60

100% = $60

So, the original price was $60.

A reseller bought a guitar for $250 and sold it for $295.

Find the percentage of the profit of the cost price.

• 12%
• 18%
• 25%
• 30%

Answer explanation

Find the change (profit/loss) first.

$295 - $250 = $45

Then, compare it with the cost price as a fraction.

$45/$250 = 0.18

Convert to percent --> 0.18 = 18%