Introduction

To round off a number, we need to determine the place value to which we want to round the number. In this case, we are rounding off the number 31.325×10 up to 4 digits.

Step 1: Identify the place value

In 31.325×10, the digit in the fourth decimal place is 5. We need to round this number up to the nearest 4 digits.

Step 2: Determine the rounding rule

If the digit in the place value we want to round is 5 or greater, we round up. If it is less than 5, we round down.

Step 3: Round the number

In this case, the digit in the fourth decimal place is 5. Therefore, we need to round up.

To round up, we add 1 to the digit in the fourth decimal place. This gives us:

31.326×10

Step 4: Check the number of digits

Finally, we need to check that we have the correct number of digits in our rounded number. We want to round to 4 digits, so we need to count the number of digits in our rounded number.

In 31.326×10, we have 5 digits. To round to 4 digits, we need to remove the last digit. This gives us:

313.26

Conclusion

To round off 31.325×10 up to 4 digits, we needed to determine the place value, identify the rounding rule, round the number, and check the number of digits. The rounded number is 313.26.

313.2