Question

add the measurements.
1.45 km + 2.7 km
write your answer with the correct number of significant figures. round if necessary.

Explanation:

Step1: Add the two numbers

$1.45 + 2.7=4.15$

Step2: Consider significant - figures

The number 2.7 has two significant figures. When adding, we round the result to the same number of decimal places as the number with the least number of decimal places among the values being added. So, 4.15 rounds to 4.2.

Answer:

4.2 km