Add and subtract multi-digits

Use mental math along with the methods we learned to answer the following questions. 62,419+27,347= 7,7845,413+2,371= 7,7846,076+1,611+252=7,93956,912+684= 57,5965,859-1,727= 4,13271,953-50,622= 21,331875,254-525,133= 350,1214,914+2,718= 7,632