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You could add the 8 and 7, and multiply the sum by 64.
Another way is to multiply 8 by 64 and 7 by 64, and add the two together.
An easier way is to say that 8 + 7 is the same as 10 + 5 so you could multiply 10 by 64 and 5 by 64.
(Remember that 5 x 64 is the same as half of 10 x 64.)