R-7 Every Subtraction problem can be rewritten as an addition problem

R-7 Every Subtraction problem can be rewritten as an addition problem

Is this true or false?

 Can you give examples?

1st idea
7-3=4
2+2=4

2nd idea
3-8=-5
3+8=11

3rd idea
3+4=7 Fact families
7-4=3

4th idea
7+(-3)=4    Using same numbers , but changing the sign of the second one.

How can you rewrite -4-(-4) as an addition problem?

Homework: Write 4 problems that prove each subtraction rule.
Comp. Q corrections due Wed 1/14