15/20 minus 6/20 which is 9/20 or 0.45
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Three fourths minus five tenths is one fourth.
1 whole = 4 fourths 4 wholes = 16 fourths 4 wholes minus 2 fourths = 16 fourths minus 2 fourths = (16 - 2) fourths = 14 fourths 14 fourths = 3 wholes plus 2 fourths, or 3 wholes plus 1 tooth.
One fifth is two tenths. 8 tenths minus 2 tenths is 6 tenths or 3 fifths.
3 tenths of course !
34/40