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
-----
__54 (0x6 x 0xe = 6 x 14 = 84 = 0x54)
__c0 (0x6 x 0x20)
_460 (0x50 x 0xe)
_a00 (0x50 x 0x20)
-----
_f74
Two numbers that you can multiply together to get 72 are: 36 and 2.
20
-17
The quantity of two numbers is the product of the two numbers. Just multiply them together. The answer is the quantity of the two numbers.
The two numbers are -12 and 36
The numbers will be the square root of 1120
The two numbers you can multiply together to equal 782 are 23 by 34.
The two numbers you multiply together to equal 391 are 17 by 23.
Two numbers that you can multiply together to get 72 are: 36 and 2.
The 2 numbers that multiply together to equal 678 are 6 and 113.
-30
20
5 and -3
The numbers are: -1 and -20
Product = multiply.
-17
The quantity of two numbers is the product of the two numbers. Just multiply them together. The answer is the quantity of the two numbers.