3.87 - 2.59 = ?
3.87 - 2.59 = 3 + 0.87 - 2 + 0.59
=$ \left(3 +\dfrac{87}{99} \right) $-$ \left(2 +\dfrac{59}{99} \right) $
= 1 +$ \left(\dfrac{87}{99} -\dfrac{59}{99} \right) $
= 1 +$ \dfrac{28}{99} $
= 1.28.
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