$\left( 300+40+4 \right) \times 4$
Distribute $4$ through the parentheses$300 \times 4+40 \times 4+4 \times 4$
Multiply the numbers$1200+40 \times 4+4 \times 4$
Multiply the numbers$1200+160+4 \times 4$
Multiply the numbers$1200+160+16$
Calculate the sum of the positive numbers$1376$