The idea is to subtract 1/2 minus 9/10 (or the other way round).
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Nine tenths minus four tenths is five tenths, which is also a half.
Nine tenths is greater than one half. If you have a pie and you took half of it away you would have another half of a pie left. If you took nine tenths of a pie away then you would be left with a tiny sliver. Another way to solve it is to make the denominator into ten so if you made one half into tenths it would be five tenths and everyone knows nine is greater than five.
one and five tenths or one and a half
abs(9 - 3)/2
The sum of (eight and nine tenths) plus (nine and eight tenths) is (eighteen and seven tenths). 8.9 + 9.8 = 18.7