1.	Solve h + 2 = 5 mentally.
		A.	h = 5	B.	h = 7
		C.	h = 2	D.	h = 3
		Hint
	2.	Solve 15 − d = 9 mentally.
		A.	d = 24	B.	d = 6
		C.	d = 3	D.	d = 9
		Hint
	3.	Solve s − 8 = 14 mentally.
		A.	s = 8	B.	s = 6
		C.	s = 14	D.	s = 22
		Hint
	4.	Solve 12 + h = 22 mentally.
		A.	h = 12	B.	h = 34
		C.	h = 10	D.	h = 8
		Hint
	5.	Solve 9 + t = 17 mentally.
		A.	t = 8	B.	t = 9
		C.	t = 10	D.	t = 26
		Hint