Question

How do you round 689.49 to the nearest unit?

Answer 1

Hint: Here in this question, we have to round off the number to its nearest unit or round off to nearest whole number. While rounding off the number, the change of the number depends upon the previous number or the number which is present next to the number which we are rounding off. Hence, we obtain the required result for the question.

Complete step-by-step answer:
The following rules are followed when rounding off a decimal to the nearest whole number:
I.The number to be rounded off is identified.
II.The digit in one place is marked.
III.The first digit to right of the decimal, or in tenths place, is checked.
IV.If the tenths digit is less than or equal to 4, then the number in the ones place is rounded off to a whole number.
V.Similarly, if the tenths digit is greater than or equal to 5, add 1 digit to the number in the one place.
VII.Drop all digits after the decimal point to result in the desired whole number.

Now consider the given number 689.46
When we write the given number to there place value we have
Firstly, we have to the round of hundredths place i.e., 9 which is greater than 5 then then number 4 which is in tenths place increases to the next digit or increase 1 whole number i.e., 4 in changes to 5
Then the given number becomes 689.5
Now we have to round off the tenths place i.e., 5 which is equal to then there is no change in one place.
Then the given number becomes 689 which is a whole number.
 Hence, the round number of 689.49 is 689.
So, the correct answer is “ 689.”.

Note: The rounding off method or the rule will be the same for the both system of numbers that is Indian number system and the international number system and it is same for the decimal number also. The rule will depend on the smaller place value and hence we can round off the number.