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## Should I round up or down?

The rule you need to remember is: “If **the digit is less than 5, round the previous digit down**; if it’s 5 or greater, round the previous digit up.” To round a digit down means to leave it unchanged; to round a digit up means to increase it by one unit.

## How do you round decimals in Java?

**1 Answer**

- double roundOff = Math.round(a * 100.0) / 100.0; Output is.
- 123.14. Or.
- double roundOff = (double) Math. round(a * 100) / 100; this will do it for you as well.

## How do you round to 2 decimal places?

**Rounding to decimal places**

- look at the first digit after the decimal point if rounding to one decimal place or the second digit for two decimal places.
- draw a vertical line to the right of the place value digit that is required.
- look at the next digit.
- if it’s 5 or more, increase the previous digit by one.

## How do you round to 2 decimal places in math?

Rounding off to the nearest hundredths is the same as rounding it to 2 decimal places. To round off a number to 2 decimal places, look **at the digit in the thousandths place**. If the digit in the thousandths place is greater or equal to 5, the hundredths digit is increased by one unit.

## How do you round off and round up?

**Here’s the general rule for rounding:**

- If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up. Example: 38 rounded to the nearest ten is 40. …
- If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down. Example: 33 rounded to the nearest ten is 30.

## Why do we round 5 up and not down?

WE do this because when you round, generally it is **with decimals that are rational or long**. When there is 5.000000000000000001, it is better to round up. So, lets say you have the square root of 26 (5.09901951359) It’s close to 6 than to 4.

## When counting people do you round up?

Rule: When the calculated sample size is not a whole number, it should be **rounded up to the next higher whole number**. Rule: Rounding up a sample size calculation for conservativeness ensures that your sample size will always be representative of the population.

## What is .2f in Java?

printf(“%. 2f”, val); In short, the %. 2f syntax tells **Java to return your variable ( val ) with 2 decimal places** ( . 2 ) in decimal representation of a floating-point number ( f ) from the start of the format specifier ( % ).

## How do you round to 2 decimal places in JavaScript?

Use the **.** **toFixed() Method** to Round a Number To2 Decimal Places in JavaScript. We apply the . toFixed() method on the number and pass the number of digits after the decimal as the argument.

## How do you round to 3 decimal places?

**Example**

- Round this number to 3 decimal places.
- Count along the first 3 numbers to the right of the decimal point.
- Count along the first 3 numbers to the right of the decimal point.
- Count along the first 3 numbers to the right of the decimal point.
- Look at the next number (the 4th number after the decimal place)