What is the value of a 1942 1943 1944 penny?

You need to know the coins' mint marks and conditions to have a more accurate idea of their values. In any case these coins are fairly common among collectors so they aren't worth very much. Assuming average circulation wear, retail prices are roughly

1942, 1942-D: about 10c

1942-S: about 25c

1943: 15c

1943-D: 25c

1943-S: 35c

1944: 5c

1944-D: 10c

1944-S: 7c

A dealer might pay you a nickel or a dime each.