1. **State the problem:** Simplify the expression $a + 6 - 16 \times 624 / 2 - h$. 2. **Recall order of operations:** Multiplication and division are performed before addition and subtraction, from left to right. 3. **Calculate multiplication and division first:** $$16 \times 624 = 9984$$ $$9984 / 2 = 4992$$ 4. **Substitute back into the expression:** $$a + 6 - 4992 - h$$ 5. **Simplify by combining like terms:** $$a + 6 - 4992 - h = a - h + (6 - 4992) = a - h - 4986$$ **Final simplified expression:** $$a - h - 4986$$