5. Calculating percentageshttps://peda.net/id/23577c2c2cf2022-09-05T12:42:41+03:00https://peda.net/:static/535/peda.net.logo.bg.svg<div class="license">Tämän sivun lisenssi <a rel="license" href="https://peda.net/info">Peda.net-yleislisenssi</a></div>
Calculating percentageshttps://peda.net/id/2357e9332cf2020-11-25T12:20:06+02:00<p>In general, when calculating percentages, the percentages must first be converted to fractions or decimals. A <b>percentage value</b> can be calculated from a number by multiplying the <b>base value</b> by a <b>percentage factor</b>.</p>
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<h3><b><span>Percentage<br/>
</span></b></h3>
<p class="p1">[[$ p $]] percents from number <em></em>[[$ a $]] is:<br/>
<br/>
<span class="center"><a href="https://peda.net/qis/2022-2023/mathematics/maths-grade-9/1pl2/pl/10_1_txt_v2-jpg#top" title="10_percentage.png"><img src="https://peda.net/qis/2022-2023/mathematics/maths-grade-9/1pl2/pl/10_1_txt_v2-jpg:file/photo/42429a0c327552f88b29a3d7b1b7b8c3cba8d4ff/10_percentage.png" alt="" title="Form a percentage factor from the percentage by dividing it by one hundred." class="inline" loading="lazy"/></a></span></p>
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<h3><b>Example 1</b></h3>
<p class="p1">How much is [[$ 20 \: \% $]] from the number [[$ 150 $]]?</p>
<p class="p1"><a href="https://peda.net/qis/2022-2023/mathematics/maths-grade-9/1pl2/pl/10_1_e1-jpg#top" title="10_percentage-factor.png"><img src="https://peda.net/qis/2022-2023/mathematics/maths-grade-9/1pl2/pl/10_1_e1-jpg:file/photo/978c88548b15650037057116f1a1043d874915a0/10_percentage-factor.png" alt="" title="The percentage value 20 % can be converted either into a fraction or a decimal." class="inline" loading="lazy"/></a></p>
<h3><b>Example 2</b></h3>
<p class="p1">A pair of jeans shrinks by [[$ 3 \: \% $]] the first time they are washed. How much shorter will the jeans be after the first wash if their original length was [[$ 98 \: \text {cm} $]]?<br/>
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<b>Solution:</b><br/>
<br/>
[[$ \displaystyle\frac {3} {100} \cdot 98 \: \text {cm} = 0,03 \cdot 98 \: \text {cm} ≈ 2,9 \: \text {cm} $]]<b></b></p>
<p class="p1"><b>Answer:</b> The jeans will shrink by [[$ 2,9\: \text {cm} $]].</p>
2022-09-05T12:42:41+03:00Exerciseshttps://peda.net/id/235ae86a2cf2020-09-11T14:18:31+03:00<a href="https://peda.net/id/235b4cd92cf" rel="noopener" target="_blank">Basic exercises<br/>
</a><a href="https://peda.net/id/2361baf92cf" rel="noopener" target="_blank">Applied exercises</a>2022-09-05T12:42:41+03:00