Here is another Matchstick puzzle. May be you have seen it. I have used Cotton Swabs in my picture below. I have used a digital display.
ORIGINAL: 23 x 1 = 91
By moving THREE or less swabs make the equation appear correct. You cannot completely remove swabs.
Use 2 swabs for +, one swab for -, two swabs for multiply x and one swab for divide (/).
The number Zero has 6 swabs. One has 2 swabs. Two, three, five and nine have 5 swabs each. Four has 4 swabs. Six has 6 swabs. Seven has 3 swabs. Eight has 7 swabs.