ROUND, ROUNDUP, ROUNDDOWN in Excel - Cell-by-Cell Formula Trace

Sample Data

This data shows three decimal numbers in column A and the number of decimal places to round to in column B.

Cell	Value
A1	3.14159
A2	2.71828
A3	-1.23456
B1	2
B2	1
B3	0

Formula Trace

=ROUND(A1,B1)

Step 1: ROUND(3.14159, 2)

Cell Reference Map

    A       B
1 |3.14159 | 2 |
2 |2.71828 | 1 |
3 |-1.23456| 0 |

The formula uses the value in cell A1 (3.14159) and rounds it to the number of decimal places specified in B1 (2).

Result

    A       B       C
1 |3.14159 | 2 | 3.14 |
2 |2.71828 | 1 |      |
3 |-1.23456| 0 |      |

The result of the formula ROUND(A1,B1) is 3.14 shown in cell C1.

Sheet Trace Quiz - 3 Questions

What does ROUND(2.71828, 1) return?

A 2.7

B 3

C 2.72

D 2.71

Key Result

ROUND(number, digits) rounds to nearest; ROUNDUP always rounds away from zero; ROUNDDOWN always rounds towards zero.

Practice

1. What does the ROUND function do in Excel?

easy

A. Rounds a number normally, up or down, based on the next digit

B. Always rounds a number up

C. Always rounds a number down

D. Truncates the number without rounding

Solution

1. Step 1: Understand the ROUND function behavior

   The ROUND function rounds a number to a specified number of digits, rounding up or down depending on the next digit.

2. Step 2: Compare with other rounding functions

   ROUNDUP always rounds up, and ROUNDDOWN always rounds down, so ROUND is the normal rounding method.

3. Final Answer:

   Rounds a number normally, up or down, based on the next digit -> Option A

4. Quick Check:

   ROUND = Normal rounding [OK]

Hint: ROUND rounds normally; ROUNDUP always up; ROUNDDOWN always down [OK]

Common Mistakes:

• Confusing ROUND with ROUNDUP or ROUNDDOWN
• Thinking ROUND always rounds up
• Assuming ROUND truncates without rounding

2. Which of the following is the correct syntax to round the number in cell A1 up to 2 decimal places?

easy

A. =ROUND(A1, 2)

B. =ROUNDUP(A1)

C. =ROUNDDOWN(A1, 2)

D. =ROUNDUP(A1, 2)

Solution

1. Step 1: Identify the function for rounding up

   ROUNDUP is the function that always rounds a number up to the specified decimal places.

2. Step 2: Check the syntax for decimal places

   The syntax is ROUNDUP(number, num_digits), so =ROUNDUP(A1, 2) rounds up to 2 decimals.

3. Final Answer:

   =ROUNDUP(A1, 2) -> Option D

4. Quick Check:

   ROUNDUP with 2 decimals = =ROUNDUP(A1, 2) [OK]

Hint: ROUNDUP always rounds up; specify decimals as second argument [OK]

Common Mistakes:

• Using ROUND instead of ROUNDUP for always rounding up
• Omitting the number of decimals argument
• Using ROUNDUP without decimals argument

3. What is the result of =ROUND(3.456, 2) in Excel?

medium

A. 3.45

B. 3.46

C. 3.40

D. 3.50

Solution

1. Step 1: Identify the digit to round to

   The formula rounds the number 3.456 to 2 decimal places, so we look at the third decimal digit (6).

2. Step 2: Apply normal rounding rules

   Since the third decimal digit is 6 (which is 5 or more), the second decimal digit (5) rounds up to 6.

3. Final Answer:

   3.46 -> Option B

4. Quick Check:

   3.456 rounded to 2 decimals = 3.46 [OK]

Hint: Look at next digit: 5 or more rounds up, less rounds down [OK]

Common Mistakes:

• Rounding down incorrectly when next digit is 5 or more
• Confusing decimal places with whole number rounding
• Choosing 3.45 instead of 3.46

4. You want to always round down the number in cell B2 to 1 decimal place, but your formula =ROUNDDOWN(B2) is not working as expected. What is the fix?

medium

A. Change formula to =ROUNDDOWN(B2, 1)

B. Change formula to =ROUND(B2, 1)

C. Change formula to =ROUNDUP(B2, 1)

D. Add a minus sign: =ROUNDDOWN(-B2, 1)

Solution

1. Step 1: Identify missing argument in ROUNDDOWN

   The ROUNDDOWN function requires two arguments: the number and the number of digits to round to.

2. Step 2: Add the missing decimal places argument

   Adding 1 as the second argument rounds down to 1 decimal place: =ROUNDDOWN(B2, 1).

3. Final Answer:

   =ROUNDDOWN(B2, 1) -> Option A

4. Quick Check:

   ROUNDDOWN needs decimal places argument [OK]

Hint: Always include decimal places as second argument [OK]

Common Mistakes:

• Omitting the number of digits argument
• Using ROUND or ROUNDUP instead of ROUNDDOWN
• Adding unnecessary minus sign

5. You have a price list with values like 12.345, 7.891, and 5.678 in column C. You want to create a new column that always rounds these prices up to the nearest whole number. Which formula should you use in cell D2 and drag down?

hard

A. =ROUNDDOWN(C2, 0)

B. =ROUND(C2, 0)

C. =ROUNDUP(C2, 0)

D. =INT(C2)

Solution

1. Step 1: Understand the rounding requirement

   You want to always round prices up to the nearest whole number, so decimals should round up regardless of value.

2. Step 2: Choose the correct function and arguments

   ROUNDUP with 0 decimal places rounds numbers up to the nearest integer, so =ROUNDUP(C2, 0) is correct.

3. Final Answer:

   =ROUNDUP(C2, 0) -> Option C

4. Quick Check:

   ROUNDUP with 0 decimals rounds up to whole number [OK]

Hint: Use ROUNDUP with 0 decimals to round up whole numbers [OK]

Common Mistakes:

• Using ROUND which rounds normally, not always up
• Using ROUNDDOWN which rounds down
• Using INT which always rounds down