Mathematics Unit 9 Percentage (I)

Mathematics

Unit 9 :

Percentage (I)

Mr Vinc Chin

 $\frac{1}{2}=$  

 $\frac{1}{2}=\frac{1}{2}\times100\%$  

 $=\frac{100\%}{2}$  

 $=50\%$  

 $50\%=$  

 $50\%=\frac{50}{100}$  

 $50\%=\frac{50\div50}{100\div50}$  

 $=\frac{1}{2}$  

Multiple Choice

Convert percentages to fractions and vice versa

 $14\%=$  

•  $\frac{7}{50}$  

•  $\frac{8}{50}$  

 $14\%\ =\ \frac{14}{100}$  

 $=\frac{14\div2}{100\div2}$  

 $=\frac{7}{50}$  

Multiple Choice

Convert percentages to fractions and vice versa

 $95\%=$  

•  $\frac{17}{20}$  

•  $\frac{19}{20}$  

 $95\%=\frac{95}{100}$  

 $=\frac{95\div5}{100\div5}$  


 $=\frac{19}{20}$  

Multiple Choice

Convert percentages to fractions and vice versa

 $30\%=$  

•  $\frac{3}{10}$  

•  $\frac{3}{11}$  

 $30\%=\frac{30}{100}$  

 $=\frac{30\div10}{100\div10}$  

 $=\frac{3}{10}$  

Multiple Choice

Convert percentages to fractions and vice versa

 $\frac{19}{25}=$  

•  $76\%$  

•  $77\%$  

 $\frac{19}{25}=\frac{19}{25}\times100\%$  

 $=\frac{1900\%}{25}$  

 $=96\%$  

Multiple Choice

Convert percentages to fractions and vice versa

 $\frac{2}{5}=$  

•  $30\%$  

•  $40\%$  

 $\frac{2}{5}=\frac{2}{5}\times100\%$  

 $=\frac{200\%}{5}$  

 $=40\%$  

Multiple Choice

Convert percentages to fractions and vice versa

 $\frac{13}{50}=$  

•  $25\%$  

•  $26\%$  

 $\frac{13}{50}=\frac{13}{50}\times100\%$  

 $=\frac{1300\%}{50}$  

 $=26\%$  

 $1\frac{1}{2}=$  

 $1\frac{1}{2}=\frac{3}{2}\times100\%$  

 $=\frac{300\%}{2}$  

 $=150\%$  

 $150\%=$  

 $150\%=\frac{150}{100}$  

 $=\frac{150\div50}{100\div50}$  

 $=\frac{3}{2}$  

 $=1\frac{1}{2}$  

Multiple Choice

Convert mix numbers to percentage and vice versa.

 $3\frac{1}{2}=$  

• 330%

• 350%

 $3\frac{1}{2}=3\frac{1}{2}\times100\%$  

 $=\frac{7}{2}\times100\%$  

 $=\frac{700\%}{2}$  

 $=350\%$  

Multiple Choice

Convert mix numbers to percentage and vice versa.

 $2\frac{1}{4}=$  

• 225%

• 250%

 $2\frac{1}{4}=2\frac{1}{4}\times100\%$  

 $=\frac{9}{4}\times100\%$  

 $=\frac{900\%}{4}$  

 $=225\%$  

Multiple Choice

Convert mix numbers to percentage and vice versa.

 $690\%$ 

•  $6\frac{8}{9}$  
  

•  $6\frac{9}{10}$  

 $690\%=\frac{690}{100}$  

 $=6\frac{90}{100}$  

 $=6\frac{90\div10}{100\div10}$  

 $=6\frac{9}{10}$  

10% from 500 =

 $10\%\ from\ 500\ =\ \frac{10}{100}\times500$  

 $=\ \frac{1}{10}\times500$   

 $=\frac{500}{10}$  

 $=50$  

250% X 300 =

 $250\%\ \times\ 300\ =\ \frac{250}{100}\times300$ 


 $=\ \frac{25}{10}\times300$   

 $=\frac{7500}{10}$  

 $=750$  

Multiple Choice

Calculate the value

40% from 50 =

• 10

• 20

 $40\%\times50=\frac{40}{100}\times50$  

 $=\frac{2000}{100}$  

 $=\frac{2000\div100}{100\div100}$  

 $=20$  

Multiple Choice

Calculate the value

65% from 800 =

• 510

• 520

 $65\%\times800=\frac{65}{100}\times800$  

 $=\frac{52000}{100}$  

 $=\frac{52000\div100}{100\div100}$  

 $=520$  

Multiple Choice

Calculate the value

15% x 260 =

• 39

• 40

 $15\%\times260=0.15\times260$  

 $=39$  

Multiple Choice

Calculate the value

22% x 1 200 =

• 264

• 268

22% x 1200 = 0.22 x 1 200

= 264

Multiple Choice

Calculate the value

120% from 1 000 =

• 1 200

• 1 300

120% from 1 000 = 1.2 x 1 000

= 1 200

Multiple Choice

Calculate the value

115% from 3 000 =

• 3 450

• 3 460

115% from 3 000 = 1.15 x 3 000

= 3 450

Multiple Choice

Calculate the value

240% x 900 =

• 2 150

• 2 160

240% x 900 = 2.4 x 900

= 2 160

Multiple Choice

Calculate the value

325% x 40 =

• 120

• 130

325% x 40 = 3.25 x 40

= 130

20 red beads

25% x 80 = 20

7 muffins

35% x 20 = 7

135 biscuits

90% x 150= 135

690 blue pens

115% x 600 = 690