Use this applet to show the relationship between these equivalent fractions:
1) 20/100, 40/200 & 60/300;
2) 30/100, 60/200 & 90/300
You may use this applet to show students that:
1) 40/200 & 60/300 are all equal to 20/100
2) 60/200 & 90/300 are all equal to 30/100
and lead them to write down the percentages of these fractions as an extension.
From here, they can then write down the percentage of the given fractions.