I need your help in helping my son with his math homework. How do you solve:?

We are trying to substitute letters for numbers so our problems are:

Were do we begin. We kind of figured out 2 of the letters, but are stuck on the rest. The problems aren't lining up for me here. The first two are subtraction problems and the rest are long division.

N I N E

- T E N

N E T S

T E N

-O N E

S H

L O N

T / T I P

T C C

I P

S P

O P

O P

S I N

H / O P E N

O H C C

T E N

T O C

T N

T S

T

I S

H / T H E

T O C

O E

O H

L

0 = C (WE THINK)

1 = L (WE THINK0

2 =

3 =

4 =

5 =

6 =

7 =

8 =

9 =