To solve this type of questions, follow the order of operations in algebra. Calculations in paranthesis are performed first, multiplications and divisions next, and addition and subtraction the last.

For example, in 50.0 + 10.0. ÷ 1.0 , the first operation is division 10.0 ÷ 1.0 which is 10. rounded to two significant figures. The second operation is 50.0 + 10. = which is 60. rounded to the smallest number of decimal places.