$\left( 200+20+6 \right) \times 3$
Distribute $3$ through the parentheses$200 \times 3+20 \times 3+6 \times 3$
Multiply the numbers$600+20 \times 3+6 \times 3$
Multiply the numbers$600+60+6 \times 3$
Multiply the numbers$600+60+18$
Calculate the sum of the positive numbers$678$