A percentage is like a fraction over $100$ and taking a percentage ‘of’ something means multiplying it by the fraction, e.g. $20\%$ of $15$ means
\begin{align*}
\frac{20}{100} \times 15 &= \frac{20\times15}{100}\\
&= \frac{300}{100}\\
&= 3
\end{align*}
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Find $30\%$ of $24$.
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$\dfrac{30}{100} \times 24 = \dfrac{720}{100} = 7.2$
Find $74\%$ of $2$.
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$\dfrac{74}{100} \times 2 = \dfrac{148}{100} = 1.48$
Find $6\%$ of $130$.
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$\dfrac{6}{100} \times 130 = \dfrac{780}{100} = 7.8$
Find $80\%$ of $30$.
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$\dfrac{80}{100} \times 30 = \dfrac{2400}{100} = 24$
Find $2\%$ of $106$.
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$\dfrac{2}{100} \times 106 = \dfrac{212}{100} = 2.12$
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The quickest way to perform a percentage increase on a calculator is to multiply by $1$ plus the percentage as a decimal. E.g. to find $12$ increased by $5\%$, type $12\times1.05$ into your calculator.
Similarly, to decrease something by a percentage, multiply by $1$ minus the percentage as a decimal. E.g. to find $152$ decreased by $3\%$, type $152\times0.97$ into your calculator.
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How would you find $20$ increased by $6\%$ using a calculator?
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How would you find $333$ increased by $24\%$ using a calculator?
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How would you find $7$ increased by $30\%$ using a calculator?
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How would you find $82$ increased by $4\%$ using a calculator?
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How would you find $36$ decreased by $9\%$ using a calculator?
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How would you find $170$ decreased by $30\%$ using a calculator?
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How would you find $85$ decreased by $7\%$ using a calculator?
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How would you find $201$ decreased by $45\%$ using a calculator?
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