Approximate vs exact match in Google Sheets - Formula Comparison Trace

Sample Data

This table shows scores and their corresponding grades. We will lookup a score (75) to find the grade using approximate and exact match.

Cell	Value
A1	Score
A2	50
A3	70
A4	90
B1	Grade
B2	C
B3	B
B4	A
D1	Lookup Score
D2	75
E1	Approximate Match
E2
F1	Exact Match
F2

Formula Trace

=VLOOKUP(D2, A2:B4, 2, TRUE)

Step 1: VLOOKUP(75, A2:B4, 2, TRUE)

Step 2: search in A2:A4 = {50, 70, 90}

Step 3: return corresponding value from column 2 in same row as 70

Step 4: =VLOOKUP(D2, A2:B4, 2, FALSE)

Step 5: search in A2:A4 = {50, 70, 90}

Step 6: formula returns #N/A error

Cell Reference Map

    A      B      C      D      E      F
1 |Score |Grade |      |Lookup |Approx |Exact 
2 |  50  |  C   |      |  75   |       |     
3 |  70  |  B   |      |       |       |     
4 |  90  |  A   |      |       |       |     

Arrows:
D2 --> VLOOKUP uses D2 as lookup value
A2:B4 --> VLOOKUP searches this range
E2 --> Approximate match result cell
F2 --> Exact match result cell

The formula looks up the value in D2 (75) in the range A2:B4. The approximate match formula result goes to E2, exact match result goes to F2.

Result

    A      B      C      D      E      F
1 |Score |Grade |      |Lookup |Approx |Exact 
2 |  50  |  C   |      |  75   |   B   | #N/A 
3 |  70  |  B   |      |       |       |     
4 |  90  |  A   |      |       |       |     

The approximate match finds grade B for score 75 because 70 is the closest lower score. The exact match returns #N/A because 75 is not exactly in the list.

Sheet Trace Quiz - 3 Questions

What grade does the approximate match formula return for score 75?

A B

B C

C A

D #N/A

Key Result

VLOOKUP(value, range, column, TRUE) finds closest lower match; with FALSE finds exact match only.

Practice

1. What does the FALSE parameter in the VLOOKUP function specify?

easy

A. It sorts the data before searching.

B. It tells VLOOKUP to find an approximate match.

C. It tells VLOOKUP to find an exact match.

D. It ignores errors in the lookup.

Solution

1. Step 1: Understand the role of the last parameter in VLOOKUP

   The last parameter in VLOOKUP is the range_lookup argument, which controls match type.

2. Step 2: Interpret FALSE in range_lookup

   FALSE means VLOOKUP looks for an exact match only, no close values.

3. Final Answer:

   It tells VLOOKUP to find an exact match. -> Option C

4. Quick Check:

   FALSE = exact match [OK]

Hint: FALSE means exact match; TRUE or omit means approximate [OK]

Common Mistakes:

• Confusing FALSE with approximate match
• Thinking FALSE sorts data
• Assuming FALSE ignores errors

2. Which of these is the correct syntax for an exact match VLOOKUP in Google Sheets?

easy

A. =VLOOKUP(A2, B2:D10, 2, TRUE)

B. =VLOOKUP(A2, B2:D10, 2, FALSE)

C. =VLOOKUP(A2, B2:D10, 2)

D. =VLOOKUP(A2, B2:D10, 2, 1)

Solution

1. Step 1: Recall the exact match parameter for VLOOKUP

   Exact match requires the fourth argument to be FALSE.

2. Step 2: Check each option

   =VLOOKUP(A2, B2:D10, 2) omits the fourth argument (defaults to TRUE, approximate). =VLOOKUP(A2, B2:D10, 2, TRUE) uses TRUE (approximate). =VLOOKUP(A2, B2:D10, 2, FALSE) uses FALSE (correct exact match). =VLOOKUP(A2, B2:D10, 2, 1) uses 1 which is approximate match.

3. Final Answer:

   =VLOOKUP(A2, B2:D10, 2, FALSE) -> Option B

4. Quick Check:

   FALSE means exact match [OK]

Hint: Use FALSE as 4th argument for exact match VLOOKUP [OK]

Common Mistakes:

• Omitting the 4th argument for exact match
• Using TRUE instead of FALSE for exact match
• Using 1 instead of FALSE in Google Sheets

3. Given this sorted data in column A: 10, 20, 30, 40, 50, what will =VLOOKUP(25, A1:A5, 1, TRUE) return?

medium

A. Error

B. 25

C. 30

D. 20

Solution

1. Step 1: Understand approximate match behavior

   With TRUE (approximate), VLOOKUP finds the largest value less than or equal to the lookup value.

2. Step 2: Find largest value ≤ 25 in the list

   Values are 10, 20, 30, 40, 50. The largest value ≤ 25 is 20.

3. Final Answer:

   20 -> Option D

4. Quick Check:

   Approximate match returns closest lower value [OK]

Hint: Approximate match returns closest smaller or equal value [OK]

Common Mistakes:

• Expecting exact 25 to be found
• Choosing next higher value 30
• Thinking TRUE means exact match

4. You used =VLOOKUP(15, A1:B5, 2, TRUE) but got wrong results. The data in column A is unsorted. What is the fix?

medium

A. Sort column A ascending or use FALSE for exact match.

B. Change TRUE to 1 in the formula.

C. Remove the 4th argument entirely.

D. Use HLOOKUP instead.

Solution

1. Step 1: Identify problem with approximate match on unsorted data

   Approximate match (TRUE) requires sorted data; unsorted data causes wrong results.

2. Step 2: Fix by sorting data or using exact match

   Either sort column A ascending or use FALSE for exact match to avoid errors.

3. Final Answer:

   Sort column A ascending or use FALSE for exact match. -> Option A

4. Quick Check:

   Approximate match needs sorted data [OK]

Hint: Approximate match needs sorted data or use FALSE for exact [OK]

Common Mistakes:

• Using 1 instead of FALSE (still approximate)
• Removing 4th argument causes approximate match on unsorted data
• Switching to HLOOKUP without reason

5. You have a price table sorted by quantity: 1= $10, 5= $8, 10= $6. Which formula finds the correct price for quantity in A2 using approximate match?

hard

A. =VLOOKUP(A2, A1:B3, 2, TRUE)

B. =VLOOKUP(A2, {1,10,5,8,10,6}, 2, TRUE)

C. =VLOOKUP(A2, A1:B3, 2, FALSE)

D. =VLOOKUP(A2, A1:B3, 2)

Solution

1. Step 1: Recognize approximate match use case

   Price depends on quantity ranges, so approximate match (TRUE) finds closest lower quantity price.

2. Step 2: Check data sorting and formula correctness

   Data in A1:B3 is sorted by quantity ascending. Using TRUE for approximate match is correct. =VLOOKUP(A2, A1:B3, 2, TRUE) matches this.

3. Final Answer:

   =VLOOKUP(A2, A1:B3, 2, TRUE) -> Option A

4. Quick Check:

   Approximate match with sorted data finds correct price [OK]

Hint: Use TRUE with sorted data for range pricing lookups [OK]

Common Mistakes:

• Using FALSE causes no approximate match
• Incorrect array syntax in option A
• Omitting 4th argument defaults to TRUE but less clear