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You have to first get the eighths and the ninths to the same fraction. Multiply 8 by 9 = 64ths. Then cross - multiply the top numbers by the opposite dividend. Ie. 7x9(ths) and 4x8(ths) and add them together = 63+32 = 95/64ths = 1 31/64ths

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Q: What is seven eighths plus four ninths?
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