ARRAYFORMULA function in Google Sheets - Cell-by-Cell Formula Trace

Sample Data

This data shows names in column A and their scores in column B.

Cell	Value
A1	Name
A2	Alice
A3	Bob
A4	Charlie
B1	Score
B2	80
B3	90
B4	85

Formula Trace

=ARRAYFORMULA(B2:B4 * 2)

Step 1: B2:B4

Step 2: B2:B4 * 2

Step 3: ARRAYFORMULA(B2:B4 * 2)

Cell Reference Map

    A       B       C
1 | Name  | Score |       
2 | Alice |  80   |       
3 | Bob   |  90   |       
4 | Charlie| 85   |       

Formula in C2: =ARRAYFORMULA(B2:B4 * 2)
Arrows: B2:B4 → C2:C4

The formula in cell C2 references the range B2:B4 to multiply each score by 2 and outputs results in C2 to C4.

Result

    A       B       C
1 | Name  | Score | Double Score
2 | Alice |  80   | 160         
3 | Bob   |  90   | 180         
4 | Charlie| 85   | 170         

The ARRAYFORMULA outputs the doubled scores in column C for each row corresponding to the scores in column B.

Sheet Trace Quiz - 3 Questions

What does the ARRAYFORMULA function do in this example?

A It multiplies each score in B2:B4 by 2 and outputs all results at once.

B It multiplies only the first score in B2 by 2.

C It sums all scores in B2:B4 and multiplies the total by 2.

D It copies the scores from B2:B4 without changes.

Key Result

ARRAYFORMULA applies a formula to an entire range and outputs an array of results.

Practice

1. What does the ARRAYFORMULA function do in Google Sheets?

easy

A. Applies a formula to an entire range of cells at once

B. Deletes all data in a selected range

C. Sorts data alphabetically

D. Converts numbers to text format

Solution

1. Step 1: Understand the purpose of ARRAYFORMULA

   ARRAYFORMULA lets you apply one formula to many cells without copying it manually.

2. Step 2: Compare options with ARRAYFORMULA's function

   Only Applies a formula to an entire range of cells at once describes applying a formula to a range at once, which matches ARRAYFORMULA's use.

3. Final Answer:

   Applies a formula to an entire range of cells at once -> Option A

4. Quick Check:

   ARRAYFORMULA = apply formula to range [OK]

Hint: Think: one formula, many cells at once [OK]

Common Mistakes:

• Confusing ARRAYFORMULA with sorting or deleting data
• Thinking it changes data format instead of applying formulas
• Assuming it works only on single cells

2. Which of the following is the correct syntax to use ARRAYFORMULA to multiply each value in column A by 2?

easy

A. =ARRAYFORMULA(A1:A * 2)

B. =ARRAYFORMULA(2 * A1)

C. =ARRAYFORMULA(A1:A + 2)

D. =ARRAYFORMULA(A1:A2 * 2)

Solution

1. Step 1: Identify correct range and operation

   We want to multiply all values in column A (A1:A) by 2, so the range must be A1:A and operation is * 2.

2. Step 2: Check each option's syntax

   =ARRAYFORMULA(A1:A * 2) correctly uses ARRAYFORMULA with A1:A * 2. =ARRAYFORMULA(2 * A1) uses only A1 (single cell), C adds 2 instead of multiplying, D uses A1:A2 which is only two cells.

3. Final Answer:

   =ARRAYFORMULA(A1:A * 2) -> Option A

4. Quick Check:

   ARRAYFORMULA(range * 2) = correct syntax [OK]

Hint: Use full column range like A1:A for all rows [OK]

Common Mistakes:

• Using a single cell reference instead of a range
• Using incorrect range like A1:A2 for whole column
• Mixing addition instead of multiplication

3. Given column A contains numbers 1, 2, 3 in cells A1, A2, A3 respectively, what will be the output of =ARRAYFORMULA(A1:A3 * 10)?

medium

A. [1, 2, 3, 10]

B. [10, 20, 30]

C. Error: Incorrect range

D. [10, 20]

Solution

1. Step 1: Understand the input range and operation

   The formula multiplies each value in A1:A3 by 10. Values are 1, 2, 3.

2. Step 2: Calculate each multiplication

   1*10=10, 2*10=20, 3*10=30, so output is [10, 20, 30].

3. Final Answer:

   [10, 20, 30] -> Option B

4. Quick Check:

   Multiply each cell by 10 = [10, 20, 30] [OK]

Hint: Multiply each cell value inside ARRAYFORMULA [OK]

Common Mistakes:

• Expecting a single value instead of array output
• Confusing range size or output length
• Thinking it returns an error for valid ranges

4. You wrote =ARRAYFORMULA(A1:A + B1:B) but get an error. What is the likely cause?

medium

A. Formula needs to be entered in multiple cells

B. ARRAYFORMULA cannot add ranges

C. You must use SUM instead of +

D. Ranges A1:A and B1:B are not the same size

Solution

1. Step 1: Check range sizes in the formula

   ARRAYFORMULA requires ranges to be the same size to add element-wise. A1:A and B1:B are open-ended ranges but must cover same rows.

2. Step 2: Identify cause of error

   If one range is longer or shorter, Google Sheets throws an error because it can't match cells one-to-one.

3. Final Answer:

   Ranges A1:A and B1:B are not the same size -> Option D

4. Quick Check:

   Matching range sizes needed for element-wise addition [OK]

Hint: Ensure ranges have equal length for element-wise operations [OK]

Common Mistakes:

• Thinking ARRAYFORMULA can't add ranges
• Using SUM instead of element-wise +
• Entering formula in multiple cells instead of one

5. You have a list of prices in column A and quantities in column B. Which formula correctly calculates total sales for each row using ARRAYFORMULA?

hard

A. =ARRAYFORMULA(PRODUCT(A2:A, B2:B))

B. =ARRAYFORMULA(SUM(A2:A * B2:B))

C. =ARRAYFORMULA(A2:A * B2:B)

D. =ARRAYFORMULA(A2:A + B2:B)

Solution

1. Step 1: Understand the goal

   We want to multiply price by quantity for each row to get total sales per row.

2. Step 2: Analyze each option

   =ARRAYFORMULA(A2:A * B2:B) multiplies each price by quantity element-wise, which is correct. =ARRAYFORMULA(SUM(A2:A * B2:B)) sums all products into one value, not per row. =ARRAYFORMULA(A2:A + B2:B) adds instead of multiplies. =ARRAYFORMULA(PRODUCT(A2:A, B2:B)) uses PRODUCT which multiplies all values together, not element-wise.

3. Final Answer:

   =ARRAYFORMULA(A2:A * B2:B) -> Option C

4. Quick Check:

   Element-wise multiplication for totals = =ARRAYFORMULA(A2:A * B2:B) [OK]

Hint: Use element-wise * inside ARRAYFORMULA for row totals [OK]

Common Mistakes:

• Using SUM inside ARRAYFORMULA for per-row totals
• Adding instead of multiplying values
• Using PRODUCT which multiplies all values together