Question

899+344的简便计算？

Answer 1

899+344
=（899+1）+（344-1）
=900+343
=1243

Answer 2

899+344=（899+1）+（344-1）=900+343=1243

Answer 3

899+344
=（900-1）+344
=900+344-1
=1244-1
=1243

Answer 4

899+344=900-1+344=1244-1=1243

Answer 5

899+344的简便计算？
899+344
=（900-1）+344
=900+344-1
=1244-1
=1243