You may be able to find a multipication operator in your assembler instruction set, but for something this basic, I would recommend developping your own specialized version using shift registers and addition - this will be much more efficient in clock cycles as opposed to a canned multiplier.
XRA A
// Set A register to 0
LXI B,0909
// Load 9 into register B and 9 into register C
// These are the numbers to multiply (adjust accordingly)
LOOP: ADD B
// Adds 9 to register A
// If your assembler does not handle variables,
// drop the LOOP: and refer to the line number
// when you want to return to this point
DCR C
// decrease the value in register C by one
JNZ LOOP
// checks for Zero flag, if not found returns to LOOP
// use the two bytes of your line number if you can not use LOOP
HLT
// Halt your program