In the sum of 54.34 and 45.66, the number of significant figure for the

answer is

5

Explanation:

54.34+45.66=100.00 (you have to use the. 00 because when you add to numbers you keep the number of decimals)

so you get 100.00

all numbers that are not 0 are sig figs so 1 is a sig fig

If a number ends with a 0 after a decimal place that 0 is a sig fig

all numbers between two sig figs are sig figs so that would make all of the numbers sig figs