LibreOffice Math

"    A) "{15} over {5} ~+~ {30} over {5} ~=~ <?> over <?>
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"    B) "{80} over {8} ~+~ {28} over {7} ~=~ <?> over <?>
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"    C) "{123} over {3} ~-~ {90} over {6} ~=~ <?> over <?>
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"    D) "{192} over {8} ~-~ {272} over {8} ~=~ <?> over <?>
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"    E) "{190} over {2} ~cdot~ {138} over {2} ~=~ <?> over <?>
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"    F) "{656} over {8} ~cdot~ {270} over {3} ~=~ <?> over <?>
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"    G) "{66} over {2} ~div~ {28} over {2} ~=~ <?> over <?>
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"    H) "{48} over {8} ~div~ {165} over {5} ~=~ <?> over <?>