852 = 800 + 50 + 2
143 = 100 + 40 + 3
2 + 3 = 5
50 + 40 = 90
800 + 100 = 900
900 + 90 + 5 = 995
852 + 143 = ( 800 + 50 + 2) + ( 100 + 40 + 3) = (3 + 2) + ( 50 + 40 )+ (800 + 100) = 5 + 90 + 900 = 995
852
+
143
995
852 = 800 + 50 + 2
143 = 100 + 40 + 3
2 + 3 = 5
50 + 40 = 90
800 + 100 = 900
900 + 90 + 5 = 995
852 + 143 = ( 800 + 50 + 2) + ( 100 + 40 + 3) = (3 + 2) + ( 50 + 40 )+ (800 + 100) = 5 + 90 + 900 = 995
852
+
143
995