Question

Result of operation $(0.87+0.58)\times 1.06$ according to significant figures is

Answer 1

$(0.87+0.58)=1.45$
Because, by significant figures, the number of digits after the decimal point in the sum is equal to the minimum of that of the two numbers that are being added.
$1.45\times 1.06$
$=1.54$
Because, by significant figures, the number of significant digits in the product is equal to the minimum of that of the two numbers being multiplied.