The answer to (7tenths) - (1quater) = 0.45
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7/10 minus 1/6 is 8/15
7/10 - 1/5 = 7/10 - 2/10 = 5/10 = 1/2
One fifth is two tenths. 8 tenths minus 2 tenths is 6 tenths or 3 fifths.
2 and a half 10/4=2.5
two tenths or, simplified, one fifth.