here are apple's out of warranty repairs costs for iPads. unlike iPhones, there is no lower price for screen only repairs
Pad mini, iPad mini 2: $199
iPad, iPad 2, iPad Air: $249
iPad 3rd generation, iPad 4th generation, iPad mini 3, iPad mini 4, iPad Air 2: $299
iPad Pro 9.7-inch: $379
iPad Pro 12.9-inch: $599
figure out which ipad that is, its approximate value on eBay or swappa, and see if you think its worth fixing.
it seems to me that you can take broken iPads, pay the replacement fee, and then sell the replacement they give you for nearly what you paid to have it fixed.
if its cellular, i would get a replacement. their resale value as used devices are worth the replacement cost