ARRAYFORMULA function in Google Sheets - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the ARRAYFORMULA function do in Google Sheets?

ARRAYFORMULA lets you apply a formula to a whole range of cells at once, instead of writing the formula in each cell separately.

beginner

How do you write an ARRAYFORMULA to add two columns A and B for all rows?

Use =ARRAYFORMULA(A1:A + B1:B) to add each value in column A to the corresponding value in column B for all rows.

intermediate

Can ARRAYFORMULA handle logical comparisons like checking if values in column A are greater than 10?

Yes! For example, =ARRAYFORMULA(A1:A > 10) returns TRUE or FALSE for each cell in column A depending on the condition.

beginner

What happens if you use ARRAYFORMULA with a single cell reference like =ARRAYFORMULA(A1)?

It just returns the value of that single cell. ARRAYFORMULA is most useful when working with ranges, not single cells.

beginner

Why might you use ARRAYFORMULA instead of copying a formula down many rows?

ARRAYFORMULA saves time and keeps your sheet cleaner by applying one formula to many rows automatically, avoiding manual copying.

What is the main purpose of ARRAYFORMULA in Google Sheets?

A Create charts automatically

B Apply a formula to a range of cells at once

C Sort data alphabetically

D Format cells with colors

ARRAYFORMULA applies a formula to an entire range, saving time and effort.

Which formula correctly sums columns A and B for all rows using ARRAYFORMULA?

A =ARRAYFORMULA(SUM(A1:A, B1:B))

B =SUM(A1:A, B1:B)

C =ARRAYFORMULA(A1:A + B1:B)

D =A1 + B1

ARRAYFORMULA(A1:A + B1:B) adds each pair of cells row by row.

What will =ARRAYFORMULA(A1:A > 5) return?

A Sum of all values greater than 5

B The number 5 repeated

C Error because ARRAYFORMULA can't do comparisons

D TRUE or FALSE for each cell in A1:A depending on if the value is greater than 5

ARRAYFORMULA can handle logical comparisons and returns TRUE or FALSE for each cell.

If you want to multiply column A by 2 for all rows, which formula is correct?

A =ARRAYFORMULA(A1:A * 2)

B =A1:A * 2

C =MULTIPLY(A1:A, 2)

D =ARRAYFORMULA(MULTIPLY(A1, 2))

ARRAYFORMULA(A1:A * 2) multiplies each value in column A by 2.

What is a benefit of using ARRAYFORMULA instead of dragging a formula down?

A It automatically updates for new rows

B It changes cell colors

C It deletes empty rows

D It creates pivot tables

ARRAYFORMULA automatically applies to new rows without needing to drag formulas.

Explain how ARRAYFORMULA can simplify working with multiple rows in Google Sheets.

Think about how you would add two columns without ARRAYFORMULA.

Describe a real-life example where ARRAYFORMULA would save time and effort.

Imagine you have a list of sales and want to calculate commission for each sale.

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