Equivalent Fractions Percentages Decimals

Fractions Percentages Decimalso

I 100 to 1 Oo

I 50 to 0.52I 25 0.254I 20 0.25I 10 0 I10

23 0.23100

I 7 0.07100

o1134 1 13

100

oI 33 T lo l 3

Finding Percentages of Quantities

Non Calculator Calculator

Find 20 of f 84 Find 83 of 65

65 x 0.830 1 8.40yes gg20 2 16.80

Basic Use of Percentages

Find 75 of 320M Find 156 of 42

25 320 74 80 42 X 1.56 65.52

s 80 3 24

Find 15 of 82 Find 7k of 64kg10 8.20 64 x 0.0755 za o ng15 12.30

Increase a Quantity by a Given Percentage

Ext Increase 2 38 by 19

Method I Find 19 and add it on

38 x 0.19 2 7.2238 t 7.22 45.22

Method 2 Add on the percentage and find it

Increase 38 by 19Find 119

38 x 1.19 1 45.22

Decrease a Quantity by a Given Percentage

Ex Decrease 72kg by 14 0

Method I find 14 and subtract from original

72 X 0.14 10.08 Kg72 kg 10.08 Kg 61.92 kg

Method calculate remaining percentage and find it

Decrease 72kg by 14

86 remains

72 0.86 61.92 Kg

Expressing One Quantity as a Percentage of Another

Example Express 24 as a percentage of 60

24To X 100 Yo

40

F 2 1 56 students out of 228 pass an exam

Find the percentage pass rate

x too 68.4