"What is 0.138 rounded to 2 decimal places?" is the same as asking, "What is 0.138 rounded to two decimal points?" or "How to round 0.138 to two decimal places."
The main point is that you want to round 0.138 to two digits or places after the decimal point. Thus, we want to eliminate the last digit in 0.138.
To eliminate the last digit in 0.138, we use the following Two Decimal Places Rules to get the answer:
Two Decimal Places Rule #1: If the last digit in 0.138 is less than 5, then remove the last digit.
Two Decimal Places Rule #2: If the last digit in 0.138 is 5 or more and the second to the last digit in 0.138 is less than 9, then remove the last digit and add 1 to the second to the last digit.
Two Decimal Places Rule #3: If the last digit in 0.138 is 5 or more and the second to the last digit in 0.138 is 9, and the third to the last digit is less than 9, then remove the last digit, make the second to last digit 0, and add 1 to the third to the last digit.
Two Decimal Places Rule #4: If the last digit in 0.138 is 5 or more and the second to the last digit is 9, and the third to the last digit is 9, then add 1 to the number on the left side of the decimal point and make the right side of the decimal point 00.
When rounding 0.138 to two decimal places we use Two Decimal Places Rule #2. Therefore, the answer to "What is 0.138 rounded to 2 decimal places?" is:
0.14
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