Answer:

1、0.36+2.64=3 ; 3+0.384=3.384;

2、5.26+0.74=6 ; 6+3.43=9.43;

3、3.7+6.3= 10 ; 1.29+0.7 1=2 ; 10+2= 12;

4、3.9+ 1. 1=5 ; 4.08+3.92=8 ; 5+8= 13;

Add the above four steps to get the answer.