Answer
$-\frac{33}{40}$
Work Step by Step
$23\frac{7}{8}-24\frac{7}{10}$
$=-24\frac{7}{10}+23\frac{7}{8}$
$=-(24\frac{7}{10}-23\frac{7}{8})$
$=-(24\frac{28}{40}-23\frac{35}{40})$
$=-(23\frac{68}{40}-23\frac{35}{40})$
$=-\frac{33}{40}$
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