Wite the answer to the problem below, using the correct number of significant figures 18.432 + 5.55 + 19.3

18.432 + 5.55 + 19.3

We can notice that the last number in the process of addition is 19.3 | with 1 decimal place value / 3 significant figures |

It is better to change all values to 1 decimal place value / 3 significant figures

18.432 → 18.4

5.55 → 5.6 (5 rounds up)

19.3 → 19.3

Let us add:

18.4 + 5.6 + 19.3 = 43.3

If you add the original numbers, you will get

18.432 + 5.55 + 19.3 = 43.282

43.282 ≈ 43.3