Give the correct number of significant figures and units to the problem below. 56 mm + 4.5 m = A) 61 mm B) 61 m C) 61 m² D) 4.6 m E) 4.56 m

Question

Quizplus · Accepted Answer

To add measurements of different units, we must convert everything to the same unit. We can convert 56 mm to meters by dividing by 1000, so it becomes 0.056 m.

Now, we can add:

0.056 m + 4.5 m = 4.556 m

The least precise measurement given is 4.5 m, which has two significant figures. Therefore, our answer should have two significant figures as well.

Answer D, 4.6 m, rounds to two significant figures and has the correct unit of meters.

Give the Correct Number of Significant Figures and Units to the Problem