1.	Which addition problem checks the subtraction problem?
		A.		B.
		C.		D.
		Hint
	2.	Which addition problem checks the subtraction problem?
		A.		B.
		C.		D.
		Hint
	3.	Which addition problem checks the subtraction problem?
		A.		B.
		C.		D.
		Hint
	4.	Which addition problem checks the subtraction problem?
		A.		B.
		C.		D.
		Hint
	5.	Which addition problem checks the subtraction problem?
		A.		B.
		C.		D.
		Hint