Question

how many significant figures are in the sum of 22.82 + 2.2457 ?
a 5
b 2
c 3
d 4

Explanation:

Step1: Calculate the sum

$22.82+2.2457 = 25.0657$

Step2: Determine significant - figures for addition

When adding, we round the result to the least number of decimal places among the numbers being added. 22.82 has two decimal places and 2.2457 has four decimal places. So we round 25.0657 to two decimal places, getting 25.07.
The number 25.07 has 4 significant figures.

Answer:

d. 4