Dak Prescott threw for 302 yards and three touchdowns Sunday as the Dallas Cowboys overcame a slew of first half mistakes to knock off the shorthanded New York Giants 44-20 in Arlington, Texas.Prescott completed 22 of 32 passes, making up for a sloppy first half in which he tossed an interception and lost a fumble. Ezekiel Elliott added 110 yards and a late touchdown on 21 rushes as Dallas (4-1) assumed a two-game lead on Philadelphia and Washington in the NFC East.New York hung with the Cowboys for just over a half before its injury-riddled offense simply couldn’t keep pace. The Giants (1-4) lost running back Saquon Barkley (ankle), quarterback Daniel Jones (concussion) and receiver Kenny Golladay in the first half.Rookie receiver Kadarius Toney tried to keep New York in contention with a career-high 10 catches for 189 yards before being ejected in the fourth quarter for throwing a punch. Backup quarterback Mike Glennon completed 16 of 25 passes for 196 yards and a late touchdown to Devontae Booker, but also tossed two interceptions, including a garbage time pick-six to Anthony Brown.The Cowboys started the scoring with Greg Zuerlein’s 31-yard field goal at the 6:20 mark of the first quarter. They made it 10-0 when Prescott found CeeDee Lamb for a 49-yard touchdown pass with 12:06 left in the first half.