Discussed initial
plans with classmates who arrived at answer immediately through knowledge of
place values, base 10, borrowing & trading and regrouping

a 
4 
b 
+ 
2 
c 
5 
__________ 

d 
1 
e 
Numbers were inserted via trail & error
the following numbers were
determined to be correct

6 
4 
3 
+ 
2 
7 
5 
__________ 

9 
1 
8 
1,2,3,
4,5,6,7,8,9,
a=6
b=3
c=7
d=9
e=8