How to Repair Tile: 6 Steps (with Pictures) - wikiHow
Split the tile through the horizontal hole-line by using a ball-peen hammer to tap a cold chisel into the tile. Tap very lightly so as not to crack neighboring grout joints. Remove the loosened pieces. Use a flat bar to pry up any shards that you cannot get up by hand. Scrape the remaining old mortar from the subfloor using a stiff-bladed scraper.