Note:
Use Q2, Q4, Q7, Q8 from Fractions Decimals and Percentages (GCSE)
This is a non-calculator topic.
Q1
Convert \dfrac{4}{10} to a decimal.
Answer: 0.4
Wrong answers:
0.2
0.8
0.44
Workings:
\dfrac{4}{10}=4\div 10 = 0.4
Q3
Convert 0.28 to a percentage.
Answer: 28 \%
Wrong answers:
56\%
14\%
2.8\%
Workings:
0.28=\dfrac{28}{100} =28\%
Q5
Convert \dfrac{7}{2} to a decimal.
Answer: 3.5
Wrong answers:
0.72
7.2
0.35
Workings:
\dfrac{7}{2} = 7\div 2 = 3.5
Q6
Convert \dfrac{25}{10} to a percentage
Answer: 250 \%
Wrong answers:
25\%
0.25\%
2.50\%
Workings:
\dfrac{25}{10} = \dfrac{250}{100} = 250\%
Q9
Convert 24 \% to a fraction in its simplest form.
Answer: \dfrac{6}{25}
Wrong answers:
\dfrac{12}{50}
\dfrac{3}{12}
\dfrac{1}{4}
Workings:
24 \% = 0.24 =\dfrac{24}{100}= \dfrac{12}{50}=\dfrac{6}{25}
Q10
Francesca is clearing out her wardrobe.
She gives 35 \% of her clothes away to charity.
What fraction of her clothes does she keep?
Give your answer in its simplest form.
Answer: \dfrac{13}{20}
Wrong answers:
\dfrac{14}{40}
\dfrac{26}{40}
\dfrac{7}{20}
Workings:
She gives away 35 \% = \dfrac{35}{100} = \dfrac{7}{20}
So she keeps 1-\dfrac{7}{20}=\dfrac{13}{20}