Question

Given a = 2.45 , b = 3.2 and c = 5.845, then value of $(a\times b)+c$ according to correct significant figure rule is

Answer 1

$(a\times b)=(2.45\times 3.2)=7.84$
The minimum number of significant figures between a and b is 2.
Therefore, 7.84 is rounded to 7.8
$7.8+5.845=13.645$
The minimum number of digits after decimal point in the numbers 7.8 and 5.845 is one.
Therefore, 13.645 is rounded to 13.6