What is the sum of 5 ADD 1 MULTIPLY BY10 BY 10?

To solve the expression "5 ADD 1 MULTIPLY BY 10 BY 10," we first interpret it as ( (5 + 1) \times 10 \times 10 ). This simplifies to ( 6 \times 10 \times 10 = 6 \times 100 = 600 ). Therefore, the sum is 600.