# Multiplying binary.

#### jsbush

##### Diamond Member
Hey, could someone help me out please.

would 1101.11 x 1.1011 = 1110.10111??

If its wrong could you show me how you did it please?

Thanks, your help is much appriciated.

1212.4 on calc

#### notfred

##### Lifer
Heh, that's got to be one of the most useless skills ever, multiplying fractional binary by hand.

#### jonmullen

##### Platinum Member
can you do fractional binary?

#### CrazyPerson

##### Platinum Member
you cant have "." in binary... or can you?

#### dighn

##### Lifer
10111.001101

just multiply using the same rules as you would with base 10 (multiply as if the decimals aren't there, then count the total number of digits after the decimals and apply to the final answer)

#### Ameesh

##### Lifer
Originally posted by: jsbush
Hey, could someone help me out please.

would 1101.11 x 1.1011 = 1110.10111??

If its wrong could you show me how you did it please?

Thanks, your help is much appriciated.

Booth's Algorithm

#### DaveSimmons

##### Elite Member
Originally posted by: jonmullen
can you do fractional binary?
you can do fractions in any base system. for base "g",
0.n = n * 1/g
0.0n = n * 1(g*g)
etc.

You young fellers have it easy in assembly classes now with x86 having hardware multiply and divide. When I was a lad we had to not only walk to school 5 miles uphill through the snow, but had to program 6502 and 8080 chips with just shifts and add/subtract.

#### PowerMacG5

##### Diamond Member
Originally posted by: DaveSimmons
Originally posted by: jonmullen can you do fractional binary?
you can do fractions in any base system. for base "g", 0.n = n * 1/g 0.0n = n * 1(g*g) etc. You young fellers have it easy in assembly classes now with x86 having hardware multiply and divide. When I was a lad we had to not only walk to school 5 miles uphill through the snow, but had to program 6502 and 8080 chips with just shifts and add/subtract.

Bring it on old man.