2/10 of 100 is easy just look at it...
10 isn't 100 so 10 x10 and then 2x10 so
20/100
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One half is five tenths. One fifth is two tenths. One half less one fifths is five tenths less two tenths, or three tenths. .5 - .2 = .3
On fifth is the same as two tenths.
One fifth is two tenths. 8 tenths minus 2 tenths is 6 tenths or 3 fifths.