Math Problem:

$\ 20 \times\ 2 - (1/2) \times\ 10 \times\ 2^2$

Solution

1. Parenthesis: $\ 20 \times\ 2 - \underline{0.5} \times\ 10 \times\ 2^2$

2. Exponents: $\ 20 \times\ 2 - 0.5 \times\ 10 \times\ \underline{4}$

3. Multiplication: $\underline{40} - \underline{20}$

4. Subtraction: $\underline{20}$