تدرب وحل التمرينات

$\begin{array}{rl}& \frac{30}{51}\approx \frac{30}{50}=\frac{30\times 2}{50\times 2}=\frac{60}{100}=60\mathrm{\%}\end{array}$

اكتب الأعداد النسبية التالية بصيغة نسبة مئوية:

$\frac{2}{100}$

2%

$\frac{19}{100}$

19%

$\frac{43}{100}$

43%

$\frac{79}{100}$

79%

$\frac{44}{100}$

44%

$\frac{66}{10}$

$\begin{array}{rl}& \frac{660}{100}=660\mathrm{\%}\end{array}$

$\frac{27}{10}$

$\begin{array}{rl}& \frac{270}{100}=270\mathrm{\%}\end{array}$

$\frac{54}{4}$

$\begin{array}{rl}& \frac{54\times 25}{4\times 25}=\frac{1300}{100}=1300\mathrm{\%}\end{array}$

$\frac{90}{5}$

$\begin{array}{rl}& \frac{90\times 20}{5\times 20}=\frac{1800}{100}=1800\mathrm{\%}\end{array}$

$\frac{87}{20}$

$\begin{array}{rl}& \frac{87\times 5}{20\times 5}=\frac{435}{100}=435\mathrm{\%}\end{array}$

اكتب النسب المئوية التالية بصيغة كسر عشري:

$14\mathrm{\%}$

$\begin{array}{rl}& \frac{14}{100}=0.14\end{array}$

$23\mathrm{\%}$

$\begin{array}{rl}& \frac{23}{100}=0.23\end{array}$

$70\mathrm{\%}$

$\begin{array}{rl}& \frac{70}{100}=0.70\end{array}$

$56\mathrm{\%}$

$\begin{array}{rl}& \frac{56}{100}=0.56\end{array}$

$49\mathrm{\%}$

$49\mathrm{\%}=\frac{49}{100}=0.49$

قدر النسبة المئوية للأعداد الآتية:

$\frac{8}{11}$

$\begin{array}{rl}& \frac{8}{11}\approx \frac{8}{10}=\frac{80}{100}=80\mathrm{\%}\end{array}$

$\frac{17}{19}$

$\begin{array}{rl}& \frac{17}{19}\approx \frac{17}{20}=\frac{17\times 5}{20\times 5}=\frac{85}{100}=85\mathrm{\%}\end{array}$

$\frac{30}{51}$

$\begin{array}{rl}& \frac{30}{51}\approx \frac{30}{50}=\frac{30\times 2}{50\times 2}=\frac{60}{100}=60\mathrm{\%}\end{array}$

$\frac{10}{101}$

$\begin{array}{rl}& \frac{10}{101}\approx \frac{10}{100}=10\mathrm{\%}\end{array}$

$2\frac{3}{4}$

$\begin{array}{rl}& 2\frac{3}{4}=\frac{11}{4}=\frac{11\times 25}{4\times 25}=\frac{275}{100}=275\mathrm{\%}\end{array}$