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The same way as any other two numbers, just remembering that each digit can have the value 0-F, and that carrying from one column to the next is in units of 1016 (= 1610). You may find it easier to convert the numbers to decimal, do the multiplication in decimal and convert the answer back to hexadecimal; or to convert each multiplication to decimal as you do it and convert the answer back to hexadecimal (I tend to do half this way, half directly).

For example:

0x56 x 0x2e: (using long multiplication, writing out each multiplication answer, underscores are used as spaces align the columns)

__2e

__56 X

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__54 (0x6 x 0xe = 6 x 14 = 84 = 0x54)

__c0 (0x6 x 0x20)

_460 (0x50 x 0xe)

_a00 (0x50 x 0x20)

-----

_f74

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14y ago
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Q: How do you multiply two hexadecimal numbers together?
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