How do you find 88 mod 187 with explanation?

You can exclude power if you want

c = 88^7 mod 187

88^7 = 40867559636992

Take 88^7 divide by 187

40867559636992 : 187 = 218543099663,058....

Take the whole part of this number --->
218543099663

Multiply this for 187

218543099663 x 187 = 40867559636981

Now subtract 88^7 and 40867559636981

40867559636992 - 40867559636981 = 11