Question

write 39.9748 correct to three significant figures​

Answer 1

39.9748

39.975 If last number is greater than 5 simply add 1

4 39.97 if after 5 digit is even so simply drop 5

3 40.0 7 is greater than 5 and number is 9 so simply write zero

So here is the answer of three significant figures

40.0

Hope you understand