1. The problem is to evaluate the expression $70 - 40 \div 2 + 50$. 2. According to the order of operations (PEMDAS/BODMAS), division must be performed before addition and subtraction. 3. First, calculate the division part: $40 \div 2 = 20$. 4. Substitute back into the expression: $70 - 20 + 50$. 5. Now perform the subtraction and addition from left to right: - $70 - 20 = 50$ - $50 + 50 = 100$ 6. Therefore, the value of the expression is $100$.