MSUBU - MIPS instruction reference

msubuMultiply-subtract unsigned 
Multiplies $t1 by $t2 treating both as unsigned 32-bit integers, then subtracts the 64-bit product from HI:LO.
Forms  msubu ,   
Operands $t1 Any general-purpose register, $0 to $31, using its numeric or named spelling, such as $8 or $t0 ($zero is $0; $ra is $31). 
$t2 A general-purpose register. It may be the same register as $t1. 
Use 'mfhi'/'mflo' to read the result.
 # Start accumulator at 100, then subtract 6 times 7. Inspect LO: 58.
li $t0, 100
mtlo $t0
mthi $zero
li $t0, 6
li $t1, 7
msubu $t0, $t1
mflo $t2