Question

Round off 231.45 to four, three and two significant digits.

Answer 1

Answer:

Round 231.45 to four, three, and two significant digits:

The first significant digit in 231.45 is the 2. The next three digits are 3, 1, and 4. Since the 4 is followed by a 5, I'll round the 4 up to 5. Because the original 5 came after the decimal point, I'll drop that digit (and place) from my answer.

Answer 2

Given - 231.45

Find - Round off to four, three and two significant figures.

Answer - To round off any number there are several rules that need to be followed. The number given in question which is 231.45, contains five significant figures. To round off the number to-

Four significant figures-

Remove the last or fifth significant figure. The rule for this step is, if a number is equal to five, which is removed, the digit before that will be added with one if odd or left as it is if even.

Hence, number with four significant figures will be - 231.4

Three significant figures -

Here, the rule applies will be, if a number is less than five, which has to be removed, than the digit before it remains same.

Hence, the number in three significant figures will be 231.

Two significant figures -

The same rule as above will be followed here too. Hence, the number in two significant figures will be 230.